Fix the tool-use loop in the Go, Rust, and Ruby clients and add a tool-loop smoke test (#200)
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* Fix the tool-use loop in the Go, Rust, and Ruby clients and add a tool-loop smoke test ## Motivation and Context Only the Python and TypeScript clients implemented a correct tool-use loop. The other three had bugs that break ordinary multi-step requests: - **Go, Rust, Ruby** did a single tool round and then called Claude once more *without* `tools`, so any request that needs a second tool call stalled. Go silently dropped `tool_use` blocks from that final response. - **Ruby** called Claude once per `tool_use` block, each time with a single `tool_result`. Parallel tool calls produced a malformed message sequence and an API 400. - **max_tokens** was 1000 in TypeScript and Ruby, 1024 in Go, and unset in Rust. Sonnet 5 thinks adaptively, so 1000 tokens is regularly exhausted mid-thought. Python already used 10000 with a comment explaining why. - **Ruby** never forwarded MCP `isError` as `is_error`, so the model could not tell a failed tool call from a successful one. Rust cannot set the flag either (see below). - **TypeScript** forwarded raw MCP content blocks to Anthropic. The two block shapes differ, so a non-text result would have failed. The existing smoke test never noticed because it only checks that each client calls `tools/list`. None of these bugs was reachable without an API key. ### What changed All five clients now run the same loop: call tools until Claude answers without one, send every `tool_result` of a turn in one user message, pass `tools` on every call, and stop after `MAX_TOOL_TURNS = 10`. `max_tokens` is 10000 everywhere, with the same comment. Python and TypeScript also keep the last response's text when the turn cap is hit; it used to be dropped. Rust keeps the `genai` crate. Its tool-response type has no `is_error` field, so an error result is marked with an `Error:` prefix in the text and the limitation is commented. ### New smoke test `tests/helpers/tool-loop-test.ts` starts a fake Anthropic Messages API on a loopback port, points a client at it through `ANTHROPIC_BASE_URL`, pipes in one query, and checks every request the client sends. It scripts two parallel tool calls, then a call to a tool the mock server lacks (an `isError` result), then a final answer, and asserts that tools are passed each time, `max_tokens` is 10000, all `tool_result`s arrive in one message with matching ids, and the error is forwarded. `smoke-test.sh` runs it for Python, TypeScript, Go, and Ruby. The Rust client is excluded for now: `genai` reads no endpoint variable, and the client negotiates protocol `2025-11-25`, under which the mock's array-rooted tool is refused at call time. Both will be addressed in a follow-up that brings all examples to current SDK versions. ## How Has This Been Tested? - `./tests/smoke-test.sh` passes for every example. - The new tool-loop test passes all 19 checks for Python, TypeScript, Go, and Ruby. - The Rust client was driven through the same scripted conversation with a temporary endpoint resolver (not committed) and passes. - As a negative check, the Ruby client from `main` was run through the new test. It fails 10 of 19 checks, on exactly the bugs listed above. - Go and Ruby were built and run in `golang:1.25` and `ruby:3.4` containers. ## Breaking Changes None. The clients' command lines, output format, and no-key behavior are unchanged. ## Types of changes - [x] Bug fix (non-breaking change which fixes an issue) - [ ] New feature (non-breaking change which adds functionality) - [ ] Breaking change (fix or feature that would cause existing functionality to change) - [x] Documentation update ## Checklist - [x] I have read the [MCP Documentation](https://modelcontextprotocol.io) - [x] My code follows the repository's style guidelines - [x] New and existing tests pass locally - [x] I have added appropriate error handling - [x] I have added or updated documentation as needed ## Additional context Two pre-existing issues surfaced while testing and are left for a follow-up: - The Rust client (rmcp 3.1.2) negotiates `2025-11-25`. The TypeScript mock server and the Python weather server both reject its calls to array-rooted tools under that revision. Even current rmcp defaults to `2025-11-25`, so the client must request `2026-07-28` explicitly. - The Go SDK's tool-result helper sends content as a list of text blocks rather than a string. The API accepts both, so it is unchanged. AI assistance: the analysis, code changes, test helper, and this description were prepared partially manually, partially with Claude Code and reviewed by me. * Improvements * Address comments
This commit is contained in:
Alex Akimov
GitHub
parent
3844c5b45e
commit
470d1ba328
9 changed files with 695 additions and 140 deletions
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@ -17,10 +17,13 @@ import (
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"github.com/modelcontextprotocol/go-sdk/mcp"
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)
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// A string literal rather than an anthropic.Model constant: the pinned SDK
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// version predates this model and has no constant for it.
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var model anthropic.Model = "claude-sonnet-5"
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// Sonnet 5 thinks adaptively unless told otherwise, and max_tokens caps thinking
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// plus the reply, so leave room for both.
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const maxTokens = 10000
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const maxToolTurns = 10
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type MCPClient struct {
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anthropic *anthropic.Client
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session *mcp.ClientSession
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@ -166,19 +169,17 @@ func (c *MCPClient) ProcessQuery(ctx context.Context, query string) (string, err
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anthropic.NewUserMessage(anthropic.NewTextBlock(query)),
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}
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var finalText []string
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// Initial Claude API call with tools
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response, err := c.anthropic.Messages.New(ctx, anthropic.MessageNewParams{
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Model: model,
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MaxTokens: 1024,
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Messages: messages,
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Tools: c.tools,
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})
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response, err := c.createMessage(ctx, messages)
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if err != nil {
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return "", fmt.Errorf("anthropic API request failed: %w", err)
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return "", err
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}
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// Keep calling tools until Claude answers without one, up to a cap.
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for turn := 0; turn < maxToolTurns; turn++ {
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var toolUseBlocks []anthropic.ToolUseBlock
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var finalText []string
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for _, block := range response.Content {
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switch b := block.AsAny().(type) {
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case anthropic.TextBlock:
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@ -192,10 +193,7 @@ func (c *MCPClient) ProcessQuery(ctx context.Context, query string) (string, err
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return strings.Join(finalText, "\n"), nil
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}
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// Append assistant's response to message history
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messages = append(messages, response.ToParam())
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// Execute each tool call and collect responses
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// Execute every tool call in this response and collect the results
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var anthropicToolResults []anthropic.ContentBlockParamUnion
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for _, toolUseBlock := range toolUseBlocks {
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// Add information about the tool call to final text
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@ -234,30 +232,50 @@ func (c *MCPClient) ProcessQuery(ctx context.Context, query string) (string, err
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))
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}
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// Append tool responses to message history
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// Append the assistant's response and all tool results, in one user
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// message, to the history. Every tool_use needs a matching tool_result.
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messages = append(messages, response.ToParam())
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messages = append(messages, anthropic.NewUserMessage(anthropicToolResults...))
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// Make another API call with tool results
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response, err = c.anthropic.Messages.New(ctx, anthropic.MessageNewParams{
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Model: model,
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MaxTokens: 1024,
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Messages: messages,
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})
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response, err = c.createMessage(ctx, messages)
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if err != nil {
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return "", fmt.Errorf("anthropic API request with tool results failed: %w", err)
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return "", err
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}
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}
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// Collect text from final response
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// The turn cap was hit. Keep the last response's text. If it asked for
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// more tools, say they were not run.
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wantsTools := false
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for _, block := range response.Content {
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switch b := block.AsAny().(type) {
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case anthropic.TextBlock:
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finalText = append(finalText, b.Text)
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case anthropic.ToolUseBlock:
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wantsTools = true
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}
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}
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if wantsTools {
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finalText = append(finalText, fmt.Sprintf("[Stopped after %d tool-use turns]", maxToolTurns))
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}
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return strings.Join(finalText, "\n"), nil
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}
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// createMessage calls Claude with the current history. Tools are passed on
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// every call so Claude can keep calling them across turns.
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func (c *MCPClient) createMessage(ctx context.Context, messages []anthropic.MessageParam) (*anthropic.Message, error) {
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response, err := c.anthropic.Messages.New(ctx, anthropic.MessageNewParams{
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Model: model,
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MaxTokens: maxTokens,
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Messages: messages,
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Tools: c.tools,
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})
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if err != nil {
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return nil, fmt.Errorf("anthropic API request failed: %w", err)
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}
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return response, nil
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}
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func (c *MCPClient) ChatLoop(ctx context.Context) error {
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fmt.Println("\nMCP Client Started!")
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fmt.Println("Type your queries or 'quit' to exit.")
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@ -10,7 +10,6 @@ from mcp_types import TextContent
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load_dotenv() # load environment variables from .env
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# Claude model constant
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ANTHROPIC_MODEL = "claude-sonnet-5"
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# Sonnet 5 thinks adaptively unless told otherwise, and max_tokens caps thinking
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# plus the reply, so leave room for both.
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@ -119,6 +118,10 @@ class MCPClient:
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tools=available_tools,
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)
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# The turn cap was hit. Keep the last response's text. If it asked for
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# more tools, say they were not run.
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final_text.extend(content.text for content in response.content if content.type == "text")
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if any(content.type == "tool_use" for content in response.content):
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final_text.append(f"[Stopped after {MAX_TOOL_TURNS} tool-use turns]")
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return "\n".join(final_text)
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@ -7,6 +7,10 @@ require "mcp"
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class MCPClient
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ANTHROPIC_MODEL = "claude-sonnet-5"
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# Sonnet 5 thinks adaptively unless told otherwise, and max_tokens caps thinking
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# plus the reply, so leave room for both.
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MAX_TOKENS = 10000
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MAX_TOOL_TURNS = 10
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def initialize
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@mcp_client = nil
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@ -49,6 +53,7 @@ class MCPClient
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loop do
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print "\nQuery: "
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$stdout.flush # a pipe is not line-buffered, so show the prompt before waiting
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line = $stdin.gets
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break if line.nil?
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@ -78,40 +83,40 @@ class MCPClient
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{ name: tool.name, description: tool.description, input_schema: tool.input_schema }
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end
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# Initial Claude API call.
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response = chat(messages, tools: available_tools)
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final_text = []
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# Process response and handle tool calls.
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if response.content.any?(Anthropic::Models::ToolUseBlock)
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assistant_content = response.content.filter_map do |content_block|
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case content_block
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# Initial Claude API call with tools.
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response = chat(messages, available_tools)
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# Keep calling tools until Claude answers without one, up to a cap.
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MAX_TOOL_TURNS.times do
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tool_uses = []
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response.content.each do |block|
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case block
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when Anthropic::Models::TextBlock
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{ type: "text", text: content_block.text }
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final_text << block.text
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when Anthropic::Models::ToolUseBlock
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{ type: "tool_use", id: content_block.id, name: content_block.name, input: content_block.input }
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tool_uses << block
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end
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end
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messages << { role: "assistant", content: assistant_content }
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end
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response.content.each_with_object([]) do |content, response_parts|
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case content
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when Anthropic::Models::TextBlock
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response_parts << content.text
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when Anthropic::Models::ToolUseBlock
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# Execute tool call via MCP.
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result = @mcp_client.call_tool(name: content.name, arguments: content.input)
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response_parts << "[Calling tool #{content.name} with args #{content.input.to_json}]"
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return final_text.join("\n") if tool_uses.empty?
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# Execute every tool call in this response and collect the results.
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tool_results = tool_uses.map do |tool_use|
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result = @mcp_client.call_tool(name: tool_use.name, arguments: tool_use.input)
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final_text << "[Calling tool #{tool_use.name} with args #{tool_use.input.to_json}]"
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# structured_content is data the application can use directly; when a
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# tool returns an array, count its items rather than re-reading prose.
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is_error = result.dig("result", "isError") == true
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structured = result.dig("result", "structuredContent")
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unless result.dig("result", "isError")
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@output_schemas[content.name]&.validate_result(structured)
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response_parts << "[#{content.name} returned #{structured.length} items]" if structured.is_a?(Array)
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unless is_error
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@output_schemas[tool_use.name]&.validate_result(structured)
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final_text << "[#{tool_use.name} returned #{structured.length} items]" if structured.is_a?(Array)
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end
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# content is what the model reads.
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# content is a list of block types; forward only the text ones.
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tool_result_content = result.dig("result", "content")
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result_text = if tool_result_content.is_a?(Array)
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tool_result_content.filter_map { |content_item| content_item["text"] }.join("\n")
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@ -119,30 +124,54 @@ class MCPClient
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tool_result_content.to_s
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end
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messages << {
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role: "user",
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content: [{
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type: "tool_result",
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tool_use_id: content.id,
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content: result_text
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}]
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}
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# Get next response from Claude.
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response = chat(messages)
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response.content.each do |content_block|
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response_parts << content_block.text if content_block.is_a?(Anthropic::Models::TextBlock)
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end
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end
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end.join("\n")
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{ type: "tool_result", tool_use_id: tool_use.id, content: result_text, is_error: is_error }
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end
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def chat(messages, tools: nil)
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params = { model: ANTHROPIC_MODEL, max_tokens: 1000, messages: messages }
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params[:tools] = tools if tools
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# Append the assistant's response and all tool results, in one user
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# message, to the history. Every tool_use needs a matching tool_result.
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messages << { role: "assistant", content: assistant_content(response) }
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messages << { role: "user", content: tool_results }
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anthropic_client.messages.create(**params)
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response = chat(messages, available_tools)
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end
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# The turn cap was hit. Keep the last response's text. If it asked for
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# more tools, say they were not run.
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response.content.each do |block|
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final_text << block.text if block.is_a?(Anthropic::Models::TextBlock)
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end
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if response.content.any?(Anthropic::Models::ToolUseBlock)
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final_text << "[Stopped after #{MAX_TOOL_TURNS} tool-use turns]"
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end
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final_text.join("\n")
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end
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# Convert a response's content blocks back into request parameters. Thinking
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# blocks must go back unchanged, signature included, or the API rejects the
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# follow-up request.
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def assistant_content(response)
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response.content.filter_map do |block|
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case block
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when Anthropic::Models::TextBlock
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{ type: "text", text: block.text }
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when Anthropic::Models::ToolUseBlock
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{ type: "tool_use", id: block.id, name: block.name, input: block.input }
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when Anthropic::Models::ThinkingBlock
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{ type: "thinking", thinking: block.thinking, signature: block.signature }
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when Anthropic::Models::RedactedThinkingBlock
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{ type: "redacted_thinking", data: block.data }
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end
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end
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end
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# Tools are passed on every call so Claude can keep calling them across turns.
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def chat(messages, tools)
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anthropic_client.messages.create(
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model: ANTHROPIC_MODEL,
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max_tokens: MAX_TOKENS,
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messages: messages,
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tools: tools
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)
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end
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def anthropic_client
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@ -1,7 +1,8 @@
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use anyhow::{Context, Result, bail};
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use genai::Client;
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use genai::chat::{
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ChatMessage, ChatRequest, ChatResponse, ContentPart, Tool as GenaiTool, ToolResponse,
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ChatMessage, ChatOptions, ChatRequest, ChatResponse, ContentPart, Tool as GenaiTool,
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ToolResponse,
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};
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use jsonschema::Validator;
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use rmcp::model::{CallToolRequestParams, CallToolResult, Tool as McpTool};
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@ -13,6 +14,10 @@ use tokio::io::{self, AsyncBufReadExt, BufReader};
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use tokio::process::Command;
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const MODEL_ANTHROPIC: &str = "claude-sonnet-5";
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/// Sonnet 5 thinks adaptively unless told otherwise, and max_tokens caps thinking
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/// plus the reply, so leave room for both.
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const MAX_TOKENS: u32 = 10000;
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const MAX_TOOL_TURNS: usize = 10;
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struct MCPClient {
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anthropic: Client,
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@ -103,20 +108,20 @@ impl MCPClient {
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let mut final_text = Vec::new();
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// Initial Claude API call with tools
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let mut chat_req = ChatRequest::new(messages.clone()).with_tools(self.tools.clone());
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let mut chat_rsp = self.request_model(&chat_req).await?;
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let mut chat_rsp = self.request_model(&messages).await?;
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// Process response content - collect text and handle tool calls
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// Keep calling tools until Claude answers without one, up to a cap.
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for _ in 0..MAX_TOOL_TURNS {
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for text in chat_rsp.texts() {
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final_text.push(text.to_string());
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}
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let tool_calls = chat_rsp.tool_calls();
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if !tool_calls.is_empty() {
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// Append assistant's response to message history
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messages.push(ChatMessage::assistant(chat_rsp.content.clone()));
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if tool_calls.is_empty() {
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return Ok(final_text.join("\n"));
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}
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// Execute each tool call and collect responses
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// Execute every tool call in this response and collect the results
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let mut tool_results = Vec::new();
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for tool_call in tool_calls {
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// Add information about the tool call to final text
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@ -150,39 +155,54 @@ impl MCPClient {
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}
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// content is a list of block types; forward only the text ones.
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let payload = tool_result
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let mut payload = tool_result
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.content
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.iter()
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.filter_map(|block| block.as_text().map(|text| text.text.as_str()))
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.collect::<Vec<_>>()
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.join("\n");
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// genai's ToolResponse cannot set Anthropic's `is_error` flag, so
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// an error result is marked in the text instead.
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if tool_result.is_error.unwrap_or(false) {
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payload = format!("Error: {payload}");
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}
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tool_results.push(ContentPart::ToolResponse(ToolResponse::new(
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tool_call.call_id.clone(),
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payload,
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)));
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}
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// Append tool responses to message history
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// Append the assistant's response and all tool results, in one user
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// message, to the history. Every tool call needs a matching result.
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messages.push(ChatMessage::assistant(chat_rsp.content.clone()));
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messages.push(ChatMessage::user(tool_results));
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// Build the next request and query model
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chat_req = ChatRequest::new(messages.clone());
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chat_rsp = self.request_model(&chat_req).await?;
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chat_rsp = self.request_model(&messages).await?;
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}
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// Collect text from response
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// The turn cap was hit. Keep the last response's text. If it asked for
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// more tools, say they were not run.
|
||||
for text in chat_rsp.texts() {
|
||||
final_text.push(text.to_string());
|
||||
}
|
||||
if !chat_rsp.tool_calls().is_empty() {
|
||||
final_text.push(format!("[Stopped after {MAX_TOOL_TURNS} tool-use turns]"));
|
||||
}
|
||||
|
||||
Ok(final_text.join("\n"))
|
||||
}
|
||||
|
||||
async fn request_model(&self, chat_req: &ChatRequest) -> Result<ChatResponse> {
|
||||
/// Call Claude with the current history. Tools are passed on every call so
|
||||
/// Claude can keep calling them across turns.
|
||||
async fn request_model(&self, messages: &[ChatMessage]) -> Result<ChatResponse> {
|
||||
let chat_req = ChatRequest::new(messages.to_vec()).with_tools(self.tools.clone());
|
||||
let options = ChatOptions::default().with_max_tokens(MAX_TOKENS);
|
||||
|
||||
let response = self
|
||||
.anthropic
|
||||
.exec_chat(MODEL_ANTHROPIC, chat_req.clone(), None)
|
||||
.exec_chat(MODEL_ANTHROPIC, chat_req, Some(&options))
|
||||
.await
|
||||
.context("Anthropic chat request failed")?;
|
||||
|
||||
|
|
|
|||
|
|
@ -9,6 +9,9 @@ import dotenv from "dotenv";
|
|||
dotenv.config({ quiet: true }); // load environment variables from .env
|
||||
|
||||
const ANTHROPIC_MODEL = "claude-sonnet-5";
|
||||
// Sonnet 5 thinks adaptively unless told otherwise, and max_tokens caps thinking
|
||||
// plus the reply, so leave room for both.
|
||||
const MAX_TOKENS = 10000;
|
||||
const MAX_TOOL_TURNS = 10;
|
||||
|
||||
class MCPClient {
|
||||
|
|
@ -92,7 +95,7 @@ class MCPClient {
|
|||
|
||||
let response = await this.anthropic.messages.create({
|
||||
model: ANTHROPIC_MODEL,
|
||||
max_tokens: 1000,
|
||||
max_tokens: MAX_TOKENS,
|
||||
messages,
|
||||
tools: this.tools,
|
||||
});
|
||||
|
|
@ -133,11 +136,15 @@ class MCPClient {
|
|||
);
|
||||
}
|
||||
|
||||
// content is what the model reads.
|
||||
// content is a list of block types; forward only the text ones. MCP
|
||||
// and Anthropic block shapes differ, so other kinds need converting.
|
||||
toolResults.push({
|
||||
type: "tool_result",
|
||||
tool_use_id: toolUse.id,
|
||||
content: result.content as Anthropic.ToolResultBlockParam["content"],
|
||||
content: result.content
|
||||
.filter((block) => block.type === "text")
|
||||
.map((block) => block.text)
|
||||
.join("\n"),
|
||||
is_error: result.isError === true,
|
||||
});
|
||||
}
|
||||
|
|
@ -150,13 +157,25 @@ class MCPClient {
|
|||
|
||||
response = await this.anthropic.messages.create({
|
||||
model: ANTHROPIC_MODEL,
|
||||
max_tokens: 1000,
|
||||
max_tokens: MAX_TOKENS,
|
||||
messages,
|
||||
tools: this.tools,
|
||||
});
|
||||
}
|
||||
|
||||
// The turn cap was hit. Keep the last response's text. If it asked for
|
||||
// more tools, say they were not run.
|
||||
let wantsTools = false;
|
||||
for (const block of response.content) {
|
||||
if (block.type === "text") {
|
||||
finalText.push(block.text);
|
||||
} else if (block.type === "tool_use") {
|
||||
wantsTools = true;
|
||||
}
|
||||
}
|
||||
if (wantsTools) {
|
||||
finalText.push(`[Stopped after ${MAX_TOOL_TURNS} tool-use turns]`);
|
||||
}
|
||||
return finalText.join("\n");
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -8,6 +8,7 @@ The smoke tests verify:
|
|||
|
||||
- **Servers**: Each weather server (Python, TypeScript, Rust, Go, Ruby) can start, respond to MCP protocol requests, and honour the output schemas it advertises
|
||||
- **Clients**: Each MCP client (Python, TypeScript, Ruby, Go, Rust) can connect to a mock server and list tools
|
||||
- **Tool loop**: Each client (Python, TypeScript, Ruby, Go) runs a query through a scripted tool-use loop against a fake Anthropic API and forwards tool results correctly
|
||||
|
||||
## Structured content
|
||||
|
||||
|
|
@ -20,6 +21,20 @@ The array case is the one worth guarding. A server that advertises `{"type": "ar
|
|||
|
||||
Tool calls reach the live NWS API. When it is unreachable the tools return an error result, which the test reports as a skip rather than a failure — someone else's outage should not fail the build.
|
||||
|
||||
## Tool loop
|
||||
|
||||
Connecting and listing tools does not exercise the chat loop, so each client is also driven through three scripted queries with `tool-loop-test.ts`. No real API is involved: the helper starts a fake Anthropic Messages API on a loopback port and hands it to the client through `ANTHROPIC_BASE_URL`, which every quickstart SDK reads. The client talks to the mock MCP server as in the no-key test. The helper types each query only after the client shows its `Query:` prompt, as a person would.
|
||||
|
||||
The fake API picks a script from the query text and checks every request the client sends:
|
||||
|
||||
- **parallel tools** — a response with two `tool_use` blocks, then one for a tool the mock server lacks, then an answer. `tools` must be passed on every call, `max_tokens` must be 10000 (room for the model's adaptive thinking), every `tool_use` must get a `tool_result` in a single following user message with matching `tool_use_id`s, and the MCP `isError` result must be forwarded as `is_error`.
|
||||
- **ten tool turns** — exactly `MAX_TOOL_TURNS` tool calls, then an answer. The client must print the answer and no stop notice: nothing was cut short.
|
||||
- **endless tool turns** — a tool call on every response. The client must stop after `MAX_TOOL_TURNS` rounds, print `[Stopped after 10 tool-use turns]` once, and make no further call.
|
||||
|
||||
Finally the client must exit 0 on `quit`. A client that does one tool round and stops, drops `tools` on the follow-up call, sends one `tool_result` per message, or gets the turn cap wrong passes the no-key test and fails this one.
|
||||
|
||||
The Rust client is not covered yet. Its `genai` crate reads no environment variable for the endpoint, and it negotiates protocol `2025-11-25`, under which the mock's array-rooted tool is refused at call time.
|
||||
|
||||
## Running Tests
|
||||
|
||||
```bash
|
||||
|
|
@ -94,6 +109,22 @@ It advertises two tools whose output schemas cover both shapes a structured resu
|
|||
node tests/helpers/build/mock-mcp-server.js
|
||||
```
|
||||
|
||||
### tool-loop-test.ts
|
||||
|
||||
Runs a client through the scripted tool loop described above. It starts the fake Anthropic API, spawns the client command with `ANTHROPIC_BASE_URL` and a dummy `ANTHROPIC_API_KEY` set, types the three queries and then `quit` at the client's prompts, and reports which checks failed along with the client's output.
|
||||
|
||||
**Usage**:
|
||||
|
||||
```bash
|
||||
node tests/helpers/build/tool-loop-test.js <client command> [args...]
|
||||
```
|
||||
|
||||
**Example**:
|
||||
|
||||
```bash
|
||||
node tests/helpers/build/tool-loop-test.js node mcp-client-typescript/build/index.js tests/helpers/build/mock-mcp-server.js
|
||||
```
|
||||
|
||||
## CI/CD Integration
|
||||
|
||||
Tests run automatically on pull requests via GitHub Actions. See `.github/workflows/ci.yml` for the CI configuration.
|
||||
|
|
|
|||
378
tests/helpers/tool-loop-test.ts
Normal file
378
tests/helpers/tool-loop-test.ts
Normal file
|
|
@ -0,0 +1,378 @@
|
|||
#!/usr/bin/env node
|
||||
/**
|
||||
* Tool-loop test for clients
|
||||
*
|
||||
* Runs a quickstart client through scripted queries and checks that its
|
||||
* tool-use loop is right. Two stand-ins replace the real world:
|
||||
*
|
||||
* - the mock MCP server (mock-mcp-server.ts), passed as part of the client
|
||||
* command exactly as in the no-key client test;
|
||||
* - a fake Anthropic Messages API, started here on a loopback port and handed
|
||||
* to the client through ANTHROPIC_BASE_URL, which every quickstart SDK reads.
|
||||
*
|
||||
* Three queries are piped into one client process, and the fake API picks the
|
||||
* script from the query text:
|
||||
*
|
||||
* - "parallel tools": text plus two tool_use blocks in one response, then one
|
||||
* tool_use for a tool the mock server lacks (an error result), then an
|
||||
* answer. Checks that tools are passed on every call, max_tokens leaves
|
||||
* room for thinking, every tool_use gets a tool_result in a single
|
||||
* following user message with matching ids, and the error is forwarded.
|
||||
* - "ten tool turns": exactly MAX_TOOL_TURNS tool calls, then an answer. The
|
||||
* client must print the answer without a premature stop notice.
|
||||
* - "endless tool turns": a tool call on every response. The client must stop
|
||||
* after MAX_TOOL_TURNS rounds, say so, and make no further call.
|
||||
*
|
||||
* A client that does one tool round and stops, drops `tools` on the second
|
||||
* call, sends one tool_result per message, or gets the turn cap wrong fails
|
||||
* here and passes the no-key test.
|
||||
*
|
||||
* Usage: node tool-loop-test.js <client command> [args...]
|
||||
*/
|
||||
|
||||
import { spawn } from "node:child_process";
|
||||
import http from "node:http";
|
||||
|
||||
/** Sonnet 5 thinks adaptively; the clients reserve this much for it. */
|
||||
const EXPECTED_MAX_TOKENS = 10000;
|
||||
/** MAX_TOOL_TURNS in every client. */
|
||||
const MAX_TOOL_TURNS = 10;
|
||||
const STOP_NOTICE = `[Stopped after ${MAX_TOOL_TURNS} tool-use turns]`;
|
||||
/** Every client prints this before reading a query. */
|
||||
const PROMPT = "Query: ";
|
||||
const CLIENT_TIMEOUT_MS = 180_000;
|
||||
|
||||
const QUERIES = {
|
||||
parallel: "parallel tools",
|
||||
atLimit: "ten tool turns",
|
||||
overrun: "endless tool turns",
|
||||
} as const;
|
||||
type Scenario = keyof typeof QUERIES;
|
||||
|
||||
const FINAL_ANSWER: Record<Scenario, string> = {
|
||||
parallel: "All done.",
|
||||
atLimit: "Answered at the limit.",
|
||||
overrun: "never sent",
|
||||
};
|
||||
|
||||
type Block = Record<string, unknown> & { type: string };
|
||||
type Message = { role: string; content: string | Block[] };
|
||||
type Request = {
|
||||
model?: string;
|
||||
max_tokens?: number;
|
||||
tools?: unknown[];
|
||||
messages: Message[];
|
||||
};
|
||||
|
||||
const failures: string[] = [];
|
||||
let passed = 0;
|
||||
const calls: Record<Scenario, number> = { parallel: 0, atLimit: 0, overrun: 0 };
|
||||
|
||||
function check(condition: boolean, what: string) {
|
||||
if (condition) {
|
||||
passed++;
|
||||
} else {
|
||||
failures.push(what);
|
||||
}
|
||||
}
|
||||
|
||||
function toolResultsOf(message: Message | undefined): Block[] {
|
||||
if (!message || !Array.isArray(message.content)) return [];
|
||||
return message.content.filter((block) => block.type === "tool_result");
|
||||
}
|
||||
|
||||
/** Text content may be a string or a list of text blocks. */
|
||||
function textOf(content: unknown): string {
|
||||
if (typeof content === "string") return content;
|
||||
if (Array.isArray(content)) {
|
||||
return content
|
||||
.filter((block) => block?.type === "text")
|
||||
.map((block) => String(block.text))
|
||||
.join("\n");
|
||||
}
|
||||
return "";
|
||||
}
|
||||
|
||||
/** The scenario a request belongs to: named by its most recent user query. */
|
||||
function scenarioOf(messages: Message[]): Scenario | undefined {
|
||||
for (let i = messages.length - 1; i >= 0; i--) {
|
||||
const message = messages[i];
|
||||
if (message.role !== "user" || toolResultsOf(message).length > 0) continue;
|
||||
const text = textOf(message.content).trim();
|
||||
return (Object.keys(QUERIES) as Scenario[]).find((key) => QUERIES[key] === text);
|
||||
}
|
||||
return undefined;
|
||||
}
|
||||
|
||||
const THINKING: Block = {
|
||||
type: "thinking",
|
||||
thinking: "Two lookups are needed.",
|
||||
signature: "test-signature",
|
||||
};
|
||||
const REDACTED_THINKING: Block = { type: "redacted_thinking", data: "test-redacted-data" };
|
||||
|
||||
function toolUse(id: string, name: string, input: Record<string, unknown>): Block {
|
||||
return { type: "tool_use", id, name, input };
|
||||
}
|
||||
|
||||
function text(value: string): Block {
|
||||
return { type: "text", text: value };
|
||||
}
|
||||
|
||||
/** The scripted assistant turn for the parallel-tools query. */
|
||||
function respondParallel(n: number, request: Request): Block[] {
|
||||
const label = `parallel call ${n}`;
|
||||
const { messages } = request;
|
||||
const last = messages[messages.length - 1];
|
||||
const results = toolResultsOf(last);
|
||||
|
||||
if (n === 1) {
|
||||
check(messages.length === 1 && last.role === "user", `${label}: history is the user query`);
|
||||
// Thinking comes before the tool calls, as it does from the real model.
|
||||
return [
|
||||
THINKING,
|
||||
REDACTED_THINKING,
|
||||
text("Checking two things."),
|
||||
toolUse("tu_1", "get_alerts", { state: "CA" }),
|
||||
toolUse("tu_2", "get_forecast", { latitude: 38.58, longitude: -121.49 }),
|
||||
];
|
||||
}
|
||||
|
||||
if (n === 2) {
|
||||
check(messages.length === 3, `${label}: history has 3 messages (got ${messages.length})`);
|
||||
check(messages[1]?.role === "assistant", `${label}: assistant turn is kept in history`);
|
||||
// The API rejects a follow-up whose assistant turn lost its thinking
|
||||
// blocks, so they must be echoed back unchanged.
|
||||
const echoed = Array.isArray(messages[1]?.content) ? messages[1].content : [];
|
||||
const thinking = echoed.find((block) => block.type === "thinking");
|
||||
const redacted = echoed.find((block) => block.type === "redacted_thinking");
|
||||
check(
|
||||
thinking?.thinking === THINKING.thinking && thinking?.signature === THINKING.signature,
|
||||
`${label}: thinking block is passed back with its signature`,
|
||||
);
|
||||
check(
|
||||
redacted?.data === REDACTED_THINKING.data,
|
||||
`${label}: redacted thinking block is passed back`,
|
||||
);
|
||||
check(
|
||||
last.role === "user" && results.length === 2,
|
||||
`${label}: both tool_results arrive in one user message (got ${results.length})`,
|
||||
);
|
||||
const ids = results.map((block) => block.tool_use_id).sort().join(",");
|
||||
check(ids === "tu_1,tu_2", `${label}: tool_use_ids match (got ${ids})`);
|
||||
check(
|
||||
results.every((block) => textOf(block.content).length > 0),
|
||||
`${label}: tool_result content carries the tool's text`,
|
||||
);
|
||||
check(
|
||||
results.every((block) => block.is_error !== true),
|
||||
`${label}: successful results are not flagged as errors`,
|
||||
);
|
||||
return [toolUse("tu_3", "no_such_tool", {})];
|
||||
}
|
||||
|
||||
if (n === 3) {
|
||||
check(messages.length === 5, `${label}: history has 5 messages (got ${messages.length})`);
|
||||
check(
|
||||
results.length === 1 && results[0].tool_use_id === "tu_3",
|
||||
`${label}: second-step tool_result is present`,
|
||||
);
|
||||
check(results[0]?.is_error === true, `${label}: error result is forwarded as is_error`);
|
||||
return [text(FINAL_ANSWER.parallel)];
|
||||
}
|
||||
|
||||
check(false, `${label}: unexpected extra call`);
|
||||
return [text("extra")];
|
||||
}
|
||||
|
||||
/**
|
||||
* The scripted turn for the two turn-limit queries. Each response asks for one
|
||||
* more tool call; the previous call's result must be present. At the limit the
|
||||
* script answers on call MAX_TOOL_TURNS + 1; past it, it never stops asking.
|
||||
*/
|
||||
function respondTurnLimit(scenario: "atLimit" | "overrun", n: number, request: Request): Block[] {
|
||||
const label = `${scenario === "atLimit" ? "at-limit" : "overrun"} call ${n}`;
|
||||
const prefix = scenario === "atLimit" ? "tl" : "ov";
|
||||
const last = request.messages[request.messages.length - 1];
|
||||
const results = toolResultsOf(last);
|
||||
|
||||
if (n > 1) {
|
||||
check(
|
||||
results.length === 1 && results[0].tool_use_id === `${prefix}_${n - 1}`,
|
||||
`${label}: previous tool_result is present`,
|
||||
);
|
||||
}
|
||||
|
||||
// The initial call plus MAX_TOOL_TURNS follow-ups is the most a client makes.
|
||||
if (n > MAX_TOOL_TURNS + 1) {
|
||||
check(false, `${label}: client called past the turn limit`);
|
||||
return [text("extra")];
|
||||
}
|
||||
if (scenario === "atLimit" && n === MAX_TOOL_TURNS + 1) {
|
||||
return [text(FINAL_ANSWER.atLimit)];
|
||||
}
|
||||
// Distinct tools per scenario, so their "[Calling tool ...]" lines can be
|
||||
// told apart in the client's output.
|
||||
return scenario === "atLimit"
|
||||
? [toolUse(`${prefix}_${n}`, "get_forecast", { latitude: 40.7, longitude: -74.0 })]
|
||||
: [toolUse(`${prefix}_${n}`, "get_alerts", { state: "NY" })];
|
||||
}
|
||||
|
||||
function respond(request: Request): Block[] {
|
||||
const scenario = scenarioOf(request.messages);
|
||||
if (!scenario) {
|
||||
check(false, "request belongs to a known query");
|
||||
return [text("unknown query")];
|
||||
}
|
||||
const n = ++calls[scenario];
|
||||
|
||||
check(
|
||||
Array.isArray(request.tools) && request.tools.length === 2,
|
||||
`${scenario} call ${n}: tools are passed (got ${request.tools?.length ?? "none"})`,
|
||||
);
|
||||
check(
|
||||
request.max_tokens === EXPECTED_MAX_TOKENS,
|
||||
`${scenario} call ${n}: max_tokens is ${EXPECTED_MAX_TOKENS} (got ${request.max_tokens})`,
|
||||
);
|
||||
|
||||
return scenario === "parallel" ? respondParallel(n, request) : respondTurnLimit(scenario, n, request);
|
||||
}
|
||||
|
||||
function startFakeApi(): Promise<http.Server> {
|
||||
const server = http.createServer((req, res) => {
|
||||
let body = "";
|
||||
req.on("data", (chunk) => (body += chunk));
|
||||
req.on("end", () => {
|
||||
let request: Request;
|
||||
try {
|
||||
request = JSON.parse(body) as Request;
|
||||
} catch {
|
||||
check(false, "request body is JSON");
|
||||
res.writeHead(400).end();
|
||||
return;
|
||||
}
|
||||
const content = respond(request);
|
||||
const stopReason = content.some((block) => block.type === "tool_use")
|
||||
? "tool_use"
|
||||
: "end_turn";
|
||||
res.setHeader("content-type", "application/json");
|
||||
res.end(
|
||||
JSON.stringify({
|
||||
id: `msg_${Object.values(calls).reduce((a, b) => a + b, 0)}`,
|
||||
type: "message",
|
||||
role: "assistant",
|
||||
model: request.model,
|
||||
content,
|
||||
stop_reason: stopReason,
|
||||
stop_sequence: null,
|
||||
usage: { input_tokens: 1, output_tokens: 1 },
|
||||
}),
|
||||
);
|
||||
});
|
||||
});
|
||||
return new Promise((resolve) => server.listen(0, "127.0.0.1", () => resolve(server)));
|
||||
}
|
||||
|
||||
function runClient(
|
||||
command: string,
|
||||
args: string[],
|
||||
baseUrl: string,
|
||||
): Promise<{ code: number | null; stdout: string; stderr: string }> {
|
||||
return new Promise((resolve) => {
|
||||
const child = spawn(command, args, {
|
||||
env: { ...process.env, ANTHROPIC_BASE_URL: baseUrl, ANTHROPIC_API_KEY: "test-key" },
|
||||
stdio: ["pipe", "pipe", "pipe"],
|
||||
});
|
||||
let stdout = "";
|
||||
let stderr = "";
|
||||
// Type each line only once the client shows its prompt, as a user would.
|
||||
// Lines written ahead of time are dropped by readline-based clients, and
|
||||
// closing stdin early ends the session before the later queries.
|
||||
const lines = [...Object.values(QUERIES), "quit"];
|
||||
let prompts = 0;
|
||||
child.stdout.on("data", (chunk) => {
|
||||
stdout += chunk;
|
||||
const seen = stdout.split(PROMPT).length - 1;
|
||||
while (prompts < seen && lines.length > 0) {
|
||||
prompts++;
|
||||
child.stdin.write(`${lines.shift()}\n`);
|
||||
}
|
||||
});
|
||||
child.stderr.on("data", (chunk) => (stderr += chunk));
|
||||
const timer = setTimeout(() => {
|
||||
failures.push(`client did not exit within ${CLIENT_TIMEOUT_MS / 1000}s`);
|
||||
child.kill();
|
||||
}, CLIENT_TIMEOUT_MS);
|
||||
child.on("error", (error) => {
|
||||
clearTimeout(timer);
|
||||
failures.push(`could not start client: ${error.message}`);
|
||||
resolve({ code: null, stdout, stderr });
|
||||
});
|
||||
child.on("close", (code) => {
|
||||
clearTimeout(timer);
|
||||
resolve({ code, stdout, stderr });
|
||||
});
|
||||
});
|
||||
}
|
||||
|
||||
/** Checks on the client's output once it has exited. */
|
||||
function checkOutput(code: number | null, stdout: string) {
|
||||
check(code === 0, `client exited 0 (got ${code})`);
|
||||
check(calls.parallel === 3, `parallel: API was called 3 times (got ${calls.parallel})`);
|
||||
check(stdout.includes(FINAL_ANSWER.parallel), "parallel: client printed the final answer");
|
||||
|
||||
const expected = MAX_TOOL_TURNS + 1;
|
||||
check(calls.atLimit === expected, `at-limit: API was called ${expected} times (got ${calls.atLimit})`);
|
||||
check(calls.overrun === expected, `overrun: API was called ${expected} times (got ${calls.overrun})`);
|
||||
|
||||
// Output arrives in query order. The at-limit answer is followed by the
|
||||
// overrun query's first tool call; a stop notice between the two is wrong,
|
||||
// and exactly one must follow.
|
||||
const answerAt = stdout.indexOf(FINAL_ANSWER.atLimit);
|
||||
const overrunAt = answerAt < 0 ? -1 : stdout.indexOf("[Calling tool get_alerts", answerAt);
|
||||
check(answerAt >= 0, "at-limit: client printed the final answer");
|
||||
check(overrunAt > answerAt, "overrun: client called the tool");
|
||||
if (answerAt >= 0 && overrunAt > answerAt) {
|
||||
check(
|
||||
!stdout.slice(answerAt, overrunAt).includes(STOP_NOTICE),
|
||||
"at-limit: no stop notice after an answer at the limit",
|
||||
);
|
||||
const notices = stdout.slice(overrunAt).split(STOP_NOTICE).length - 1;
|
||||
check(notices === 1, `overrun: stop notice printed once (got ${notices})`);
|
||||
}
|
||||
}
|
||||
|
||||
async function main() {
|
||||
const [command, ...args] = process.argv.slice(2);
|
||||
if (!command) {
|
||||
console.error("Usage: node tool-loop-test.js <client command> [args...]");
|
||||
process.exit(1);
|
||||
}
|
||||
|
||||
const api = await startFakeApi();
|
||||
const address = api.address();
|
||||
if (!address || typeof address === "string") throw new Error("no port");
|
||||
const baseUrl = `http://127.0.0.1:${address.port}`;
|
||||
console.error(`Testing client tool loop: ${command} ${args.join(" ")}`);
|
||||
|
||||
const { code, stdout, stderr } = await runClient(command, args, baseUrl);
|
||||
api.close();
|
||||
checkOutput(code, stdout);
|
||||
|
||||
if (failures.length === 0) {
|
||||
console.error(`✓ Tool loop correct (${passed} checks)`);
|
||||
return;
|
||||
}
|
||||
console.error(`✗ Tool loop failed ${failures.length} of ${passed + failures.length} checks:`);
|
||||
for (const failure of failures) console.error(` - ${failure}`);
|
||||
console.error("--- client stdout ---");
|
||||
console.error(stdout.trim());
|
||||
console.error("--- client stderr ---");
|
||||
console.error(stderr.trim());
|
||||
process.exit(1);
|
||||
}
|
||||
|
||||
main().catch((error) => {
|
||||
console.error("✗ Tool loop test crashed:", error);
|
||||
process.exit(1);
|
||||
});
|
||||
|
|
@ -13,6 +13,7 @@ TESTS_DIR="${PROJECT_ROOT}/tests"
|
|||
# Setup common test variables
|
||||
TEST_CLIENT="${PROJECT_ROOT}/tests/helpers/build/mcp-test-client.js"
|
||||
MOCK_SERVER="${PROJECT_ROOT}/tests/helpers/build/mock-mcp-server.js"
|
||||
TOOL_LOOP_TEST="${PROJECT_ROOT}/tests/helpers/build/tool-loop-test.js"
|
||||
|
||||
# Track test results
|
||||
FAILED_TESTS=()
|
||||
|
|
@ -153,6 +154,57 @@ test_mcp_client_rust() {
|
|||
ANTHROPIC_API_KEY= "${client_bin}" node "${MOCK_SERVER}" >/dev/null 2>&1
|
||||
}
|
||||
|
||||
# The tool-loop tests drive the chat loop itself, which the no-key tests never
|
||||
# reach. The helper starts a fake Anthropic API on a loopback port, points the
|
||||
# client at it through ANTHROPIC_BASE_URL, and scripts one query as two
|
||||
# parallel tool calls, then a failing one, then an answer. It checks every
|
||||
# request the client sends; see tests/README.md for what is checked.
|
||||
|
||||
# Test: Python MCP client tool loop
|
||||
test_tool_loop_python() {
|
||||
check_dependency uv || return 1
|
||||
local client_dir="${PROJECT_ROOT}/mcp-client-python"
|
||||
node "${TOOL_LOOP_TEST}" uv --directory "${client_dir}" run python "${client_dir}/client.py" "${MOCK_SERVER}"
|
||||
}
|
||||
|
||||
# Test: TypeScript MCP client tool loop
|
||||
test_tool_loop_typescript() {
|
||||
check_dependency node || return 1
|
||||
check_dependency npm || return 1
|
||||
local client_dir="${PROJECT_ROOT}/mcp-client-typescript"
|
||||
ensure_built "${client_dir}" "" || return 1
|
||||
node "${TOOL_LOOP_TEST}" node "${client_dir}/build/index.js" "${MOCK_SERVER}"
|
||||
}
|
||||
|
||||
# Test: Ruby MCP client tool loop
|
||||
test_tool_loop_ruby() {
|
||||
check_dependency ruby || return 1
|
||||
check_dependency bundle || return 1
|
||||
local client_dir="${PROJECT_ROOT}/mcp-client-ruby"
|
||||
ensure_bundled "${client_dir}" || return 1
|
||||
(cd "${client_dir}" && node "${TOOL_LOOP_TEST}" bundle exec ruby client.rb "${MOCK_SERVER}")
|
||||
}
|
||||
|
||||
# Test: Go MCP client tool loop
|
||||
test_tool_loop_go() {
|
||||
check_dependency go || return 1
|
||||
local client_dir="${PROJECT_ROOT}/mcp-client-go"
|
||||
ensure_built "${client_dir}" mcp-client-go || return 1
|
||||
|
||||
local client_bin
|
||||
client_bin=$(resolve_binary "${client_dir}/mcp-client-go") || {
|
||||
print_error "no mcp-client-go binary found in ${client_dir}"
|
||||
return 1
|
||||
}
|
||||
|
||||
node "${TOOL_LOOP_TEST}" "${client_bin}" node "${MOCK_SERVER}"
|
||||
}
|
||||
|
||||
# The Rust client has no tool-loop test yet. Its genai crate reads no
|
||||
# environment variable for the API endpoint, so the fake API cannot be reached
|
||||
# without adding code to the example, and it negotiates protocol 2025-11-25,
|
||||
# under which the mock's array-rooted tool is refused at call time.
|
||||
|
||||
# Run all tests
|
||||
|
||||
print_header "Running smoke tests"
|
||||
|
|
@ -166,6 +218,10 @@ run_test "mcp-client-typescript" test_mcp_client_typescript
|
|||
run_test "mcp-client-ruby" test_mcp_client_ruby
|
||||
run_test "mcp-client-go" test_mcp_client_go
|
||||
run_test "mcp-client-rust" test_mcp_client_rust
|
||||
run_test "mcp-client-python tool loop" test_tool_loop_python
|
||||
run_test "mcp-client-typescript tool loop" test_tool_loop_typescript
|
||||
run_test "mcp-client-ruby tool loop" test_tool_loop_ruby
|
||||
run_test "mcp-client-go tool loop" test_tool_loop_go
|
||||
|
||||
# Print summary
|
||||
echo ""
|
||||
|
|
|
|||
|
|
@ -76,11 +76,12 @@ setup_test() {
|
|||
CLIENT_DIR="${PROJECT_ROOT}/${test_name}"
|
||||
TEST_CLIENT="${PROJECT_ROOT}/tests/helpers/build/mcp-test-client.js"
|
||||
MOCK_SERVER="${PROJECT_ROOT}/tests/helpers/build/mock-mcp-server.js"
|
||||
TOOL_LOOP_TEST="${PROJECT_ROOT}/tests/helpers/build/tool-loop-test.js"
|
||||
}
|
||||
|
||||
# Ensure test helpers are built
|
||||
ensure_helpers_built() {
|
||||
if [ ! -f "${TEST_CLIENT}" ] || [ ! -f "${MOCK_SERVER}" ]; then
|
||||
if [ ! -f "${TEST_CLIENT}" ] || [ ! -f "${MOCK_SERVER}" ] || [ ! -f "${TOOL_LOOP_TEST}" ]; then
|
||||
print_error "Test helpers not built"
|
||||
print_header "Building test helpers..."
|
||||
cd "${PROJECT_ROOT}/tests/helpers" || return 1
|
||||
|
|
|
|||
Loading…
Reference in a new issue