chore: sync from fn-registry agent

tool_doctor.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"os/exec"
+
+	"github.com/mark3labs/mcp-go/mcp"
+)
+
+type doctorArgs struct {
+	Subcommand string `json:"subcommand,omitempty"`
+}
+
+func doctorTool() mcp.Tool {
+	return mcp.NewTool("fn_doctor",
+		mcp.WithDescription("Run `fn doctor [subcommand] --json` and return the parsed report. Subcommands: artefacts, services, sync, uses-functions, unused. Empty = all checks. Read-only."),
+		mcp.WithString("subcommand",
+			mcp.Description("Subcommand. Empty runs all."),
+			mcp.Enum("", "artefacts", "services", "sync", "uses-functions", "unused"),
+		),
+	)
+}
+
+func (d *deps) handleDoctor(ctx context.Context, _ mcp.CallToolRequest, args doctorArgs) (*mcp.CallToolResult, error) {
+	bin := d.fnBin()
+	cmdArgs := []string{"doctor"}
+	if args.Subcommand != "" {
+		cmdArgs = append(cmdArgs, args.Subcommand)
+	}
+	cmdArgs = append(cmdArgs, "--json")
+
+	cmd := exec.CommandContext(ctx, bin, cmdArgs...)
+	cmd.Dir = d.root
+	out, err := cmd.Output()
+	if err != nil {
+		stderr := ""
+		if ee, ok := err.(*exec.ExitError); ok {
+			stderr = string(ee.Stderr)
+		}
+		return mcp.NewToolResultError("fn doctor: " + err.Error() + "\n" + stderr), nil
+	}
+
+	// Try to parse JSON; if it fails, return the raw output.
+	var report any
+	if jsonErr := json.Unmarshal(out, &report); jsonErr != nil {
+		return mcp.NewToolResultText(string(out)), nil
+	}
+	b, _ := json.MarshalIndent(map[string]any{"subcommand": args.Subcommand, "report": report}, "", "  ")
+	return mcp.NewToolResultText(string(b)), nil
+}