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 skills/mitodl/agent-kit/validate-before-commitnpx skills add mitodl/agent-kit --skill validate-before-commitgit clone --depth 1 https://github.com/mitodl/agent-kitWhat 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 | $0.00056 | $0.00382 |
| Opus 5 | $0.00028 | $0.00191 |
| Sonnet 5 | $0.00011 | $0.00076 |
| Haiku 4.5 | $0.00006 | $0.00038 |
Grade A, and why
validate-before-commit 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.
What it actually says
Validate Before Commit
Do not declare a task done until the full validation sequence has passed. Run these checks proactively — do not wait for the human to ask.
Standard sequence
# 1. Linting, formatting, and basic static checks
uv run pre-commit run --all-files
# 2. Type checking
uv run mypy <package_or_src_dir>
# 3. Infrastructure plan (if Pulumi files were changed)
pulumi preview --stack <stack-name>
Rules
- Run pre-commit before mypy; pre-commit may auto-fix formatting that would otherwise produce mypy noise.
- If pre-commit auto-fixes files, stage the changes and re-run pre-commit to confirm all hooks pass cleanly.
- mypy errors are blocking — do not leave type errors for the human to clean up.
pulumi previewoutput must be reviewed: unexpected replacements or deletions are bugs, not acceptable side effects.
For Dagster / dg changes
After modifying assets, sensors, or code location structure, also confirm the workspace loads cleanly:
dg check
Interpreting failures
Read the full error output before proposing a fix. Do not apply a speculative patch without understanding the root cause — iterating blindly on the same error multiple times is worse than pausing to diagnose.
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 · 55 lines · 56 tokens per session scan A 053dc81366e6
validate-before-commit is a skill published in the GitHub repository mitodl/agent-kit (2 stars, last pushed 3d ago), licensed BSD-3-Clause. It adds 56 tokens to every session and 382 once invoked, about $0.0003 per session on Opus 5. 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 2026-08-31.
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