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fix(anthropic): ToolChoiceNone should send tool_choice:{type:"none"} to API #178

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Merged
andreynering merged 1 commit into from
Mar 18, 2026
Merged

fix(anthropic): ToolChoiceNone should send tool_choice:{type:"none"} to API #178

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5 changes: 4 additions & 1 deletion providers/anthropic/anthropic.go
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Original file line number Diff line number Diff line change
Expand Up @@ -638,7 +638,10 @@ func (a languageModel) toTools(tools []fantasy.Tool, toolChoice *fantasy.ToolCho
},
}
case fantasy.ToolChoiceNone:
return anthropicTools, anthropicToolChoice, warnings
none := anthropic.NewToolChoiceNoneParam()
anthropicToolChoice = &anthropic.ToolChoiceUnionParam{
OfNone: &none,
}
default:
anthropicToolChoice = &anthropic.ToolChoiceUnionParam{
OfTool: &anthropic.ToolChoiceToolParam{
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31 changes: 31 additions & 0 deletions providers/anthropic/anthropic_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1333,3 +1333,34 @@ func TestStream_WebSearchResponse(t *testing.T) {
require.NotEmpty(t, textDeltas, "should have text deltas")
require.Equal(t, "Here are the results.", textDeltas[0].Delta)
}

func TestGenerate_ToolChoiceNone(t *testing.T) {
t.Parallel()

server, calls := newAnthropicJSONServer(mockAnthropicGenerateResponse())
defer server.Close()

provider, err := New(
WithAPIKey("test-api-key"),
WithBaseURL(server.URL),
)
require.NoError(t, err)

model, err := provider.LanguageModel(context.Background(), "claude-sonnet-4-20250514")
require.NoError(t, err)

toolChoiceNone := fantasy.ToolChoiceNone
_, err = model.Generate(context.Background(), fantasy.Call{
Prompt: testPrompt(),
Tools: []fantasy.Tool{
WebSearchTool(nil),
},
ToolChoice: &toolChoiceNone,
})
require.NoError(t, err)

call := awaitAnthropicCall(t, calls)
toolChoice, ok := call.body["tool_choice"].(map[string]any)
require.True(t, ok, "request body should have tool_choice")
require.Equal(t, "none", toolChoice["type"], "tool_choice should be 'none'")
}
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