# Supply Chain Security

> Supply Chain Security is an Agent Skill for devops & security published in the microsoft/apm repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Activate when reviewing or modifying dependency resolution, lockfile schema, package downloaders, signature/integrity checks, file integration cleanup, or anything that could expose APM to dependency confusion, typosquatting, malicious packages, or token leakage.

- Skill name: `supply-chain-security`
- Category: [DevOps & Security](https://www.openparable.com/skill/devops-security/1)
- Source: https://github.com/microsoft/apm/blob/HEAD/.agents/skills/supply-chain-security/SKILL.md
- Repository: microsoft/apm (3,249 GitHub stars when collected)

## SKILL.md

# Supply Chain Security Skill

[Supply chain security expert persona](../../../.apm/agents/supply-chain-security-expert.agent.md)

## When to activate

- Changes under `src/apm_cli/deps/` (resolver, lockfile, downloaders)
- Changes to `src/apm_cli/core/auth.py` or `token_manager.py`
- Changes to `src/apm_cli/integration/cleanup.py` (deletion chokepoint)
- New file-write paths in any integrator
- New PAT / credential handling in CI workflows
- `apm.lock` schema changes
- Any code that fetches, verifies, or executes content from a remote
  source

## Key rules

- All path construction routes through
  `src/apm_cli/utils/path_security.py` (no ad-hoc `".." in x`).
- All deletions of deployed files route through
  `integration/cleanup.py:remove_stale_deployed_files()` (3 safety
  gates).
- All credential reads route through `AuthResolver` -- never raw
  `os.getenv` for token vars.
- Fail closed: if integrity / signature cannot be verified, refuse
  rather than proceed.
- Token values must never appear in user-facing strings.

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Source: https://www.openparable.com/skill/devops-security/supply-chain-security (OpenParable). Cite the canonical URL above.