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signing-entitlements

Diagnose macOS app launch and trust failures by inspecting code signatures, app permissions, and Gatekeeper checks. Identify the failure category and get a minimal validation or repair sequence that distinguishes local development issues from distribution requirements.

OriginalShow the original description

Inspect macOS signing, entitlements, and Gatekeeper issues. Use when diagnosing code signing, sandbox, hardened runtime, or trust failures.

See how to install

Good for

  • Investigating a macOS app that refuses to launch
  • Checking invalid signatures or signing identities
  • Diagnosing app permissions and sandbox mismatches
  • Separating local signing issues from distribution requirements

Files included (2)

  • SKILL.md1.7 KB
  • agents/openai.yaml290 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

Signing & Entitlements

Quick Start

Use this skill when the failure smells like codesigning rather than compilation: launch refusal, missing entitlement, invalid signature, sandbox mismatch, hardened runtime confusion, or trust-policy rejection.

Workflow

  1. Inspect the bundle or binary.

    • Locate the .app or executable.
    • Identify the main binary inside Contents/MacOS/.
  2. Read signing details.

    • Use codesign -dvvv --entitlements :- <path>.
    • Use spctl -a -vv <path> when Gatekeeper behavior matters.
    • Use plutil -p for entitlements or Info.plist inspection.
  3. Classify the failure.

    • Unsigned or ad hoc signed
    • Wrong identity
    • Entitlement mismatch
    • Hardened runtime issue
    • App Sandbox issue
    • Nested code signing issue
    • Distribution/notarization prerequisite issue
  4. Explain the minimum fix path.

    • Say exactly what is wrong.
    • Show the shortest set of validation or repair commands.
    • Distinguish local development problems from distribution problems.

Useful Commands

  • codesign -dvvv --entitlements :- <app-or-binary>
  • spctl -a -vv <app-or-binary>
  • security find-identity -p codesigning -v
  • plutil -p <path-to-entitlements-or-plist>

Guardrails

  • Never invent missing entitlements.
  • Do not conflate notarization with local debug signing.
  • If the real issue is a build setting or provisioning profile, say so directly.

Output Expectations

Provide:

  • what artifact was inspected
  • what signing state it is in
  • the exact failure class
  • the minimum fix or validation sequence

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