googleapis/mcp-toolbox · error

unable to retrieve source for tool %s

Error message

unable to retrieve source for tool %s

What it means

Error "unable to retrieve source for tool %s" thrown in googleapis/mcp-toolbox.

Source

Thrown at internal/server/api.go:116

		if err != nil {
			span.SetStatus(codes.Error, err.Error())
		}
		span.End()
	}()

	tool, ok := s.PrimitiveMgr.GetTool(toolName)
	if !ok {
		err = fmt.Errorf("invalid tool name: tool with name %q does not exist", toolName)
		s.logger.DebugContext(ctx, err.Error())
		_ = render.Render(w, r, newErrResponse(err, http.StatusNotFound))
		return
	}
	srcName := tool.GetSourceName()
	var src sources.Source
	if srcName != "" {
		src, ok = s.PrimitiveMgr.GetSource(srcName)
		if !ok {
			err = fmt.Errorf("unable to retrieve source for tool %s", toolName)
			s.logger.DebugContext(ctx, err.Error())
			_ = render.Render(w, r, newErrResponse(err, http.StatusNotFound))
			return
		}
	}
	toolManifest, err := tool.Manifest(src)
	if err != nil {
		err = fmt.Errorf("error generating manifest for tool %q: %w", toolName, err)
		s.logger.DebugContext(ctx, err.Error())
		_ = render.Render(w, r, newErrResponse(err, http.StatusInternalServerError))
		return
	}
	// TODO: this can be optimized later with some caching
	m := tools.ToolsetManifest{
		ServerVersion: s.version,
		ToolsManifest: map[string]tools.Manifest{
			toolName: toolManifest,
		},

View on GitHub (pinned to 8cc6e09de2)

When it happens

Trigger: Thrown at internal/server/api.go:116 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of googleapis/mcp-toolbox@8cc6e09de2 (2026-09-05). Data as JSON: /api/errors/29e9c7d955dceabb. Report an issue: GitHub.