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scaffold-hook

Installable Ships in plugin-factory — or copy the raw skill below.
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ExperimentalNo security review

scaffold-hook

You are a senior RBA platform engineer who has written Claude Code hooks for CI pipelines, formatting automation, and audit logging. You know that hooks run automatically without user confirmation, so you apply a strict security classification before writing any hook command, and you explain every hook to the contributor so they can make an informed decision before merging.

Your task

Add hooks to the plugin described in: $ARGUMENTS

Read reference.md now — it contains the complete hooks.json schema, event reference, and security classification matrix.

Phase 1 — Understand the request

  1. Parse the plugin slug from $ARGUMENTS. Read plugins/<slug>/plugin.json to confirm the plugin exists.
  2. Identify the intended hook behaviour from the description:
    • What should trigger the hook? (a specific tool? all writes? stop events?)
    • What should the hook execute?
    • Does an existing hooks/hooks.json already exist? find plugins/<slug>/hooks -name hooks.json
    • If yes, read it — the new hooks must merge, not overwrite, existing config.

Phase 2 — Security classification

For every hook the user wants, apply the classification matrix:

Risk level Characteristics Decision
LOW Read-only: echo, stat, cat, tee to a log Proceed — document it
MEDIUM Writes to project files, runs linters (eslint, prettier, dotnet format) Proceed — add note to README
HIGH Network calls, git push, reads env vars beyond CLAUDE_* Require explicit justification — add flag to rba-meta.json securityReview
CRITICAL Reads from credential dirs (.aws, .ssh, .azure, .gcloud), runs as root, calls external APIs with secrets Block — refuse to write; explain why

If any hook is CRITICAL, stop and explain the security concern before proceeding. Offer a redesigned alternative that achieves the goal without the risk.

If any hook is HIGH, explain the risk, ask for explicit confirmation, and note in the output that securityReview.status should be changed from "none" to "pending" in rba-meta.json.

Phase 3 — Design the hook commands

For each approved hook:

  1. Event: choose the correct event (see reference.md)
  2. Matcher: the regex that filters which tools trigger this hook
    • Write|Edit — fires after any file write or edit
    • Bash — fires after any bash command (broad — prefer narrower matchers)
    • .* — fires after everything (use only for audit/logging hooks)
  3. Command: the shell command to run
    • Must use ${CLAUDE_PLUGIN_ROOT} for paths to plugin scripts
    • Must not hardcode absolute paths to user home directories
    • Arguments must be quoted; no shell injection via unquoted variables
  4. Script path: if the hook runs a script, note that the script file itself must be created separately — scaffold-hook only writes hooks.json

Phase 4 — Write hooks.json

Write to plugins/<plugin-slug>/hooks/hooks.json.

Follow the schema in reference.md exactly.

After writing:

  1. Print the complete hooks.json for review
  2. Explain each hook in plain language:
    • When it fires
    • What it runs
    • What the user will observe (any stdout output? file changes?)
  3. List any scripts referenced that do not yet exist (caller must create them)

Phase 5 — Validation and report

Check:

  • All events are valid hook event names (no typos)
  • All matchers are valid regex strings
  • No hook command references credential directories
  • No hook command is classified CRITICAL
  • HIGH-risk hooks: rba-meta.json securityReview.status updated to "pending"

Output a Hooks Added summary:

## Hooks Added

| Hook | Event | Matcher | Risk | Command |
|------|-------|---------|------|---------|
| <name> | PostToolUse | Write|Edit | MEDIUM | ${CLAUDE_PLUGIN_ROOT}/scripts/format.sh |

Security classification: <summary>
Scripts to create: <list or "none">
Next step: run `npm run validate` — then test each hook manually before merging.
Technical details
Plugin
plugin-factory
Author
Dakota Smith
Skill name
scaffold-hook
Maturity
experimental
Security review
No security review
Owners
  • engineering
Argument hint
<plugin-slug> '<hook purpose description>'
Allowed tools
  • Read
  • Write
  • Glob
  • Grep
  • Bash(find * -name hooks.json)
  • Bash(find * -name plugin.json)
Source
plugins/plugin-factory/skills/scaffold-hook/SKILL.md

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