84ffd2d7d2
Both tools declare an OutputSchema and return StructuredContent alongside the text. get_alerts returns []Alert, so it answers with a top-level JSON array rather than an array nested in an object, which protocol revision 2026-07-28 is the first to allow. "No alerts" is simply []. get_forecast returns an object, for contrast. The declared schema narrows the inferred ["null","array"] root to "array": jsonschema-go infers the nullable form because a nil slice is valid Go, but the handler always builds a slice. Error paths return an error: a tool declaring an OutputSchema MUST return conforming structured content, so a path with no data has to fail. The client compiles every declared OutputSchema at connect time and validates results against it, using jsonschema-go - already an SDK dependency, so no new one. Each channel goes to its stated reader: Content is forwarded to the model, StructuredContent is used as data, reporting how many items came back. The client no longer treats a missing .env as fatal and checks for ANTHROPIC_API_KEY after connecting rather than before, matching the Python and TypeScript clients, so the connection can be exercised without credentials. Requires go-sdk v1.7.0-pre.3: non-object output schema support (SEP-2106) landed after v1.6.1 and is in no stable release. Model identifier moves to claude-sonnet-5; the second call in the tool loop used a hardcoded ModelClaude3_7SonnetLatest while the first used the package variable, so both now use the same one. Note that the SDK sends an array-rooted schema as written on every connection rather than projecting it down, so an older client rejects the tool list. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
24 lines
774 B
Modula-2
24 lines
774 B
Modula-2
module github.com/modelcontextprotocol/quickstart-resources/mcp-client-go
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go 1.25.1
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require (
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github.com/anthropics/anthropic-sdk-go v1.14.0
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github.com/google/jsonschema-go v0.4.3
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github.com/joho/godotenv v1.5.1
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github.com/modelcontextprotocol/go-sdk v1.7.0-pre.3
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)
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require (
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github.com/segmentio/asm v1.1.3 // indirect
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github.com/segmentio/encoding v0.5.4 // indirect
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github.com/tidwall/gjson v1.18.0 // indirect
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github.com/tidwall/match v1.1.1 // indirect
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github.com/tidwall/pretty v1.2.1 // indirect
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github.com/tidwall/sjson v1.2.5 // indirect
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github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
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golang.org/x/oauth2 v0.35.0 // indirect
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golang.org/x/sync v0.20.0 // indirect
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golang.org/x/sys v0.41.0 // indirect
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golang.org/x/time v0.15.0 // indirect
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)
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