Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add commands/samibs/skillfoundry/anvilgit clone --depth 1 https://github.com/samibs/skillfoundryWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/commands/samibs/skillfoundry/anvil)<a href="https://agentmods.dev/commands/samibs/skillfoundry/anvil"><img src="https://agentmods.dev/badge/commands/samibs/skillfoundry/anvil.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00000 | $0.03148 |
| Opus 5 | $0.00000 | $0.01574 |
| Sonnet 5 | $0.00000 | $0.00630 |
| Haiku 4.5 | $0.00000 | $0.00315 |
Grade A, and why
anvil scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 349 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/anvil - The Anvil Quality Gate
6-tier (A1–A6) agent-handoff validation system that catches issues between every agent phase.
Namespace: Anvil tiers are A1–A6 — distinct from the CLI quality gates T0–T7 (
sf_cli/core/gates.ts). Different checks AND a different count (6 Anvil tiers vs 8 CLI gates); e.g. Anvil A3 = Self-Adversarial Review, CLI gate T3 = Tests. To avoid confusion, invoke Anvil tiers with theaprefix (/anvil a3), nevert3. Canonical definition:agents/_anvil-protocol.md.
Usage
/anvil Run all tiers on current story/changed files
/anvil a1 Tier A1 only (shell checks: syntax, patterns, imports, SAST)
/anvil a1 <file> Tier A1 on specific file
/anvil a2 Tier A2 (canary smoke test)
/anvil a3 Tier A3 (self-adversarial review of last implementation)
/anvil a4 Tier A4 (scope validation + Semgrep SAST deep scan)
/anvil a4 --sast-only Tier A4 SAST scan only (skip scope diff)
/anvil a5 Tier A5 (contract enforcement: API spec vs implementation)
/anvil a6 Tier A6 (shadow tester: risk assessment of changed code)
/anvil --report Full Anvil report on last story
Instructions
You are The Anvil — the quality gate that strikes between every agent handoff. When /anvil is invoked, run validation checks on the current story or changed files.
The 6 Tiers
| Tier | Name | Type | What It Catches |
|---|---|---|---|
| A1 | Shell Pre-Flight | Shell script (no LLM) | Syntax errors, banned patterns, missing files, Semgrep SAST (if installed) |
| A2 | Canary Smoke Test | Quick execution test | Module won't import, won't compile |
| A3 | Self-Adversarial Review | Coder self-critique | Untested failure modes, blind spots |
| A4 | Scope + SAST | Diff comparison + Semgrep deep scan | Scope creep, incomplete implementation, OWASP Top 10, hardcoded secrets |
| A5 | Contract Enforcement | API contract check | API drift, wrong signatures |
| A6 | Shadow Tester | Risk assessment | Priority risks for Tester |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- yesterday First seen · 349 lines · 0 tokens per session scan A 62b9084cb5e8
anvil is a command published in the GitHub repository samibs/skillfoundry (12 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 3,148 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other commands, from other repositories
checklist
Generate a custom checklist for the current feature based on user requirements.
clarify
Identify underspecified areas in the current feature spec by asking up to 5 highly targeted clarification questions and encoding answers back into the spec.
specify
Create or update the feature specification from a natural language feature description.
converge
Assess the current codebase against the feature's spec, plan, and tasks, then append any remaining unbuilt work as new tasks to tasks.md so implement can complete it.
implement
Execute the implementation plan by processing and executing all tasks defined in tasks.md.
analyze
Perform a non-destructive cross-artifact consistency and quality analysis across spec.md, plan.md, and tasks.md after task generation.