What is contract-checker?

A check that compares a JSON list of requirements with saved evidence files in one workspace.

Use it before a review or release to confirm that every requirement points to existing, permitted files.

It catches missing evidence and files stored outside the allowed workspace. It does not judge whether the evidence truly meets each requirement.

contract-checker — Skill for Claude Code and Codex by Dailyaiagents

Install

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.

Any agent

npx skills add Dailyaiagents/daily-ai-agent-toolkit --skill contract-checker

Clone the repo

git clone --depth 1 https://github.com/Dailyaiagents/daily-ai-agent-toolkit

Made for: Claude Code, Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/dailyaiagents/daily-ai-agent-toolkit/contract-checker/github.svg)](https://agentmods.dev/skills/dailyaiagents/daily-ai-agent-toolkit/contract-checker)

Your own site

<a href="https://agentmods.dev/skills/dailyaiagents/daily-ai-agent-toolkit/contract-checker"><img src="https://agentmods.dev/badge/skills/dailyaiagents/daily-ai-agent-toolkit/contract-checker/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/dailyaiagents/daily-ai-agent-toolkit/contract-checker"><img src="https://agentmods.dev/badge/skills/dailyaiagents/daily-ai-agent-toolkit/contract-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 133 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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 5.1	$0.00018	$0.00133
Opus 5.5	$0.00007	$0.00053
Sonnet 5.5	$0.00004	$0.00027
Haiku 4.5	$0.00002	$0.00013

Measured 2mo ago against content hash 27e971092b1b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

contract-checker 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 2mo ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/run.sh, scripts/selftest.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/contract-checker/SKILL.md · 20 lines

What it actually says

Contract Checker

The contract contains a non-empty requirements array. Each requirement has an id and evidence_paths.

bash scripts/run.sh --root /workspace --contract contract.json

The gate proves file presence and root containment. A separate review must determine whether the evidence actually satisfies the requirement.

Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

2mo ago First seen · 20 lines · 18 tokens per session scan A 27e971092b1b

Subscribe to this mod's changes

contract-checker is a skill published in the GitHub repository Dailyaiagents/daily-ai-agent-toolkit (0 stars, last pushed 7d ago), licensed Apache-2.0. It adds 18 tokens to every session and 133 once invoked, about $0.0001 per session on Opus 5.5. 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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