Add stripOutputSchema config for Claude Code compatibility#62
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pardeike merged 3 commits intopardeike:mainfrom Mar 29, 2026
Merged
Add stripOutputSchema config for Claude Code compatibility#62pardeike merged 3 commits intopardeike:mainfrom
pardeike merged 3 commits intopardeike:mainfrom
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Claude Code rejects MCP servers that include `outputSchema` in tools/list responses — this field is not part of the MCP tools spec. Only 4 of 110 RimBridgeServer tools carry it, but their presence causes Claude Code to drop the entire server on startup. Add `"stripOutputSchema": true` to ~/.gabs/config.json to strip the field from tools/list. Default is false so Codex and other clients that handle it are unaffected. Full tool metadata including outputSchema remains available via games.tool_detail. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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add tests |
Verify that: - outputSchema is preserved when config is false (default) - outputSchema is stripped when config is true - tools without outputSchema are unaffected - inputSchema is preserved when stripping outputSchema Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
…test - findTool helper now takes *testing.T and fails on marshal/unmarshal errors - Add test verifying stripping does not mutate the original handler.Tool Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
stripOutputSchemaboolean to~/.gabs/config.jsonthat stripsoutputSchemafromtools/listresponsesfalse— no behavior change for Codex or other MCP clientstrue, enables Claude Code to load all 110+ game tools as direct MCP toolsProblem
Claude Code rejects MCP servers that include
outputSchemain tool definitions returned bytools/list. This field is not part of the MCP tools spec (which only definesname,description,inputSchema), nor the Claude API tool spec.Only 4 of 110 RimBridgeServer tools carry
outputSchema, but their presence causes Claude Code to drop the entire GABS server. Confirmed by binary search: strippingoutputSchemais the only change needed — full tool names, descriptions, and input schemas all work at 123 tools.Config usage
{ "stripOutputSchema": true }Full tool metadata including
outputSchemaremains accessible viagames.tool_detail.Test plan
stripOutputSchema: false(default): no behavior change, Codex works as beforestripOutputSchema: true: all 123 tools (13 core + 110 game) load as direct MCP tools in Claude Codetools/list_changedworks — no disconnects aftergames.connectmcp__gabs__rimworld_rimbridge_pingreturns pong🤖 Generated with Claude Code