Supply-Chain Protection Setup

One-time project setup to harden dependency management against supply-chain attacks.

Idempotency

Before each step, check if the expected state already exists. If sfw is installed, the config already has the release-age setting, or CLAUDE.md already contains the "Dependency Supply-Chain Protection" section — skip that step and note it in the summary. This makes the skill safe to re-run without duplicating work.

Goal

Configure the repository so all dependency operations use Socket Firewall (sfw) and enforce a 48-hour minimum release age policy on packages.

Steps

1. Detect Package Manager

Inspect the repository for lockfiles and config, starting at the repo root and falling back to the current working directory:

If multiple signals exist, pick the one actually used in scripts / CI. For monorepos, apply config at the workspace root level. Report the decision before proceeding.

Success criteria: Package manager identified and stated.

2. Install Socket Firewall

• Run command -v sfw to check if sfw is already available.
• If missing, install globally: npm i -g sfw

- If the global install fails with EACCES, suggest npm i -g sfw --prefix ~/.local or ask the user for their preferred approach.

• Verify with sfw --version.

Success criteria: sfw command is available and version is confirmed.

3. Configure 48-Hour Minimum Release Age

Apply native config for the detected package manager. Preserve existing content in all config files.

If a release-age setting already exists, keep the existing value — the user may have intentionally chosen a shorter or longer period. Only add the setting if it is missing.

pnpm — update .npmrc (pnpm reads release-age settings from .npmrc, not pnpm-workspace.yaml):

minimum-release-age=2880

Yarn Berry (2+) — update .yarnrc.yml:

npmMinimalAgeGate: "2d"

Yarn Classic (1.x) — no native release-age setting exists. Skip config changes. Recommend the user migrate to pnpm or Bun for native release-age enforcement. Note this in the summary.

Bun — update bunfig.toml:

[install]
minimumReleaseAge = 172800

npm (v11.10.0+) — update .npmrc:

min-release-age=2

Note: the unit is days (not minutes or seconds). There is a known bug where tilde (~) version ranges may conflict with this setting. If npm is older than v11.10.0, skip config changes and note the limitation in the summary.

Rules:

• Do not invent settings the package manager does not support.
• Do not remove unrelated existing config.
• Preserve formatting when practical.

Success criteria: Config file updated (or skipped for npm) with the correct minimum-age setting.

4. Verify Setup

Run a quick smoke test to confirm the setup works end-to-end. For example:

sfw <pm> add is-odd --dry-run

This confirms sfw wraps the package manager correctly and the release-age config is picked up. If the dry-run fails, diagnose and fix before proceeding.

Success criteria: Dry-run install completes without errors under sfw.

5. Update CLAUDE.md

Create or update CLAUDE.md in the project root. If the file exists, first check whether a "Dependency Supply-Chain Protection" section already exists — if so, skip this step. Otherwise, append the section; do not overwrite existing content.

Substitute all {{...}} placeholders with the actual detected values before writing.

````markdown

Dependency Supply-Chain Protection

Always prefix dependency commands with sfw (Socket Firewall). Applies to install, add, update, upgrade, remove — any command that changes dependencies.

Examples: sfw {{DETECTEDPM}} add <pkg>, sfw {{DETECTEDPM}} update <pkg>.

Do not bypass sfw unless the human explicitly instructs it. ````

Success criteria: CLAUDE.md contains the supply-chain section with correct operational notes (no unsubstituted placeholders).

6. Summary

Output a concise summary:

• Detected package manager
• Whether sfw was installed or already present
• Which config file was changed (or "none" for npm)
• Whether the dry-run verification passed
• How the 48-hour rule is enforced
• Steps that were skipped (already configured)
• Any limitations

If something went wrong, note which changes were made so the user can revert via git checkout if needed.

Success criteria: User sees a clear summary of all changes.