Implements the new optional message field for progress notifications as
defined in the MCP specification update. This allows servers to provide
descriptive status updates alongside progress values.
Changes:
- Add optional message field to ProgressSchema in types.ts
- Add tests for progress notifications with message field
- Update protocol tests to verify message field handling
Refs: https://github.com/modelcontextprotocol/modelcontextprotocol/pull/197🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Add outputSchema support to Tool interface with proper documentation
- Split CallToolResult into structured and unstructured variants
- Change structuredContent from string to object type
- Add validation that tools without outputSchema cannot return structuredContent
- Add validation that tools with outputSchema must return structuredContent
- Update client to validate structured content as object (no JSON parsing)
- Update tests to use object format for structuredContent
- Add tests for new validation constraints
- Update LATEST_PROTOCOL_VERSION to DRAFT-2025-v2
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
- Add outputSchema field to Tool type and RegisteredTool interface
- Make content field optional in CallToolResult
- Update ListToolsRequestSchema handler to include outputSchema in tool list responses
- Add support for structuredContent in tool results
- Update examples to handle optional content field
- Add tests for new outputSchema and structuredContent functionality
- Update ToolCallback documentation to clarify when to use structuredContent vs content
This change enables tools to define structured output schemas and return
structured JSON content, providing better type safety and validation for
tool outputs.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
* This fixes#378
* In types.ts
- set LATEST_PROTOCOL_VERSION to "2025-03-26"
- add "2025-03-26" to SUPPORTED_PROTOCOL_VERSIONS
* In auth.test.ts
- in test "returns metadata when discovery succeeds"
- expect "MCP-Protocol-Version" to be "2025-03-26"
The SDK's custom error codes were previously using arbitrary negative numbers
(-1, -2) which could conflict with application-specific error codes. This change:
- Updates ConnectionClosed from -1 to -32000
- Updates RequestTimeout from -2 to -32001
- Keeps standard JSON-RPC error codes unchanged
- Adds documentation explaining the server error range usage
This modification ensures compliance with the JSON-RPC 2.0 specification, which
reserves -32000 to -32099 for implementation-defined server errors. This change
allows applications to freely use other error code ranges without potential
conflicts with SDK-generated errors.
Issue: #85
This doesn't impact the ability of clients to handle it (see `Client.callTool`), but does make it a type error to return the old format. This will make it easier to catch sites that haven't been updated.
