Frida session lookups, script lookups, unreadable script files and the instrument-with-frida PID and script checks returned invalid_request with no issues, while the remediation told callers to correct the listed arguments. Attach the session_id, script_id, path, target or script issue with the reason so CLI and MCP callers can see what to fix. Fixes #2213 Co-authored-by: Claude Opus 5.5 <[email protected]>