71dfbc0d3e### What was broken
`docs/quick_start.md` → *Installation* says:
```
go get github.com/modelcontextprotocol/go-sdk
```
The module root holds no importable package (only `copyright_test.go`),
so `go get` on the
module path records the requirement as `// indirect` and writes none of
the `go.sum` entries
the `mcp` package needs. A reader who runs that command and then pastes
the server snippet
from the next section hits six errors on the first build — before
writing a line of their own.
### How I checked
Followed the page verbatim on Go 1.26.4, in an empty directory:
```
$ go mod init example.com/qs
$ go get github.com/modelcontextprotocol/go-sdk
go: added github.com/modelcontextprotocol/go-sdk v1.7.0
```
`go.mod` now reads `require github.com/modelcontextprotocol/go-sdk
v1.7.0 // indirect`.
Then the two snippets from *Getting started*, saved as `server/main.go`
and `client/main.go`:
```
$ go build ./...
missing go.sum entry for module providing package github.com/google/jsonschema-go/jsonschema (imported by github.com/modelcontextprotocol/go-sdk/mcp)
missing go.sum entry for module providing package golang.org/x/oauth2 (imported by github.com/modelcontextprotocol/go-sdk/mcp)
missing go.sum entry for module providing package github.com/segmentio/encoding/json (imported by github.com/modelcontextprotocol/go-sdk/internal/json)
missing go.sum entry for module providing package github.com/yosida95/uritemplate/v3 (imported by github.com/modelcontextprotocol/go-sdk/mcp)
missing go.sum entry for module providing package golang.org/x/sync/errgroup (imported by github.com/modelcontextprotocol/go-sdk/mcp)
missing go.sum entry for module providing package golang.org/x/time/rate (imported by github.com/modelcontextprotocol/go-sdk/mcp)
```
Same directory, same snippets, asking for the package instead:
```
$ go get github.com/modelcontextprotocol/go-sdk/mcp
$ go build -o myserver ./server && go build -o myclient ./client
$ ./myclient
{"greeting":"Hi you"}
```
`go mod tidy` after the fact fixes it too — that is the escape hatch the
note mentions,
but it is not what the page tells you to do.
### What it is now
```
go get github.com/modelcontextprotocol/go-sdk/mcp
```
plus four lines saying why the module path alone is not enough, so the
next person who
copies the module path from `go.mod` or from a search result knows what
they are looking at.
Change is in `internal/docs/quick_start.src.md`; `docs/quick_start.md`
regenerated with
`go generate ./internal/docs`, both committed together. Docs-only, no
code paths touched.
---
Assisted-by: Claude Opus 5 — this PR was drafted and verified by Anton's
AI cofounder running
on his account; every command and output above is from a real run on
this machine, not a
reconstruction.
---------
Co-authored-by: Palo-Alto-AI-Research-Lab <Palo-Alto-AI-Research-Lab@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
105 lines
2.5 KiB
Markdown
105 lines
2.5 KiB
Markdown
<!-- Autogenerated by weave; DO NOT EDIT -->
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# Quick Start
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1. [Installation](#installation)
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1. [Getting started](#getting-started)
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## Installation
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```
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go get github.com/modelcontextprotocol/go-sdk/mcp
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```
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## Getting started
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To get started creating an MCP server, create an `mcp.Server` instance, add
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features to it, and then run it over an `mcp.Transport`. For example, this
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server adds a single simple tool, and then connects it to clients over
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stdin/stdout:
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```go
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package main
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import (
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"context"
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"log"
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"github.com/modelcontextprotocol/go-sdk/mcp"
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)
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type Input struct {
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Name string `json:"name" jsonschema:"the name of the person to greet"`
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}
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type Output struct {
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Greeting string `json:"greeting" jsonschema:"the greeting to tell to the user"`
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}
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func SayHi(ctx context.Context, req *mcp.CallToolRequest, input Input) (
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*mcp.CallToolResult,
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Output,
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error,
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) {
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return nil, Output{Greeting: "Hi " + input.Name}, nil
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}
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func main() {
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// Create a server with a single tool.
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server := mcp.NewServer(&mcp.Implementation{Name: "greeter", Version: "v1.0.0"}, nil)
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mcp.AddTool(server, &mcp.Tool{Name: "greet", Description: "say hi"}, SayHi)
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// Run the server over stdin/stdout, until the client disconnects.
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if err := server.Run(context.Background(), &mcp.StdioTransport{}); err != nil {
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log.Fatal(err)
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}
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}
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```
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To communicate with that server, create an `mcp.Client` and connect it to the
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corresponding server, by running the server command and communicating over its
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stdin/stdout:
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```go
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package main
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import (
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"context"
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"log"
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"os/exec"
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"github.com/modelcontextprotocol/go-sdk/mcp"
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)
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func main() {
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ctx := context.Background()
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// Create a new client, with no features.
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client := mcp.NewClient(&mcp.Implementation{Name: "mcp-client", Version: "v1.0.0"}, nil)
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// Connect to a server over stdin/stdout.
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transport := &mcp.CommandTransport{Command: exec.Command("myserver")}
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session, err := client.Connect(ctx, transport, nil)
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if err != nil {
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log.Fatal(err)
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}
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defer session.Close()
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// Call a tool on the server.
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params := &mcp.CallToolParams{
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Name: "greet",
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Arguments: map[string]any{"name": "you"},
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}
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res, err := session.CallTool(ctx, params)
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if err != nil {
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log.Fatalf("CallTool failed: %v", err)
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}
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if res.IsError {
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log.Fatal("tool failed")
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}
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for _, c := range res.Content {
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log.Print(c.(*mcp.TextContent).Text)
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}
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}
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```
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The [`examples/`](https://github.com/modelcontextprotocol/go-sdk/tree/main/examples) directory contains more example clients and
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servers.
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