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 skills add ivy00johns/Skill-Madness --skill contract-authorgit clone --depth 1 https://github.com/ivy00johns/Skill-MadnessWrote 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/skills/ivy00johns/skill-madness/contract-author)<a href="https://agentmods.dev/skills/ivy00johns/skill-madness/contract-author"><img src="https://agentmods.dev/badge/skills/ivy00johns/skill-madness/contract-author/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.
<a href="https://agentmods.dev/skills/ivy00johns/skill-madness/contract-author"><img src="https://agentmods.dev/badge/skills/ivy00johns/skill-madness/contract-author.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00170 | $0.02999 |
| Opus 5 | $0.00085 | $0.01499 |
| Sonnet 5 | $0.00034 | $0.00600 |
| Haiku 4.5 | $0.00017 | $0.00300 |
Grade A, and why
contract-author 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 9d ago.
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 — 240 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Contract Author
Tradeoff: Biases toward upfront design over fast iteration. For prototypes, skip contracts and use direct module imports.
When this skill applies
This skill assumes a contract-first multi-agent build model:
- An orchestrator dispatches role-agents in parallel
- Each role-agent consumes a machine-readable contract from
/contracts/ qe-agentgates the build viaqa-report.json
For single-agent or ad-hoc work, this skill is not the right tool.
Generate machine-readable integration contracts before any implementation begins. Contracts are the foundation of reliable multi-agent builds — specification problems cause ~42% of multi-agent failures.
Role
You are the contract author. You create the shared types, API contracts, and data layer contracts that implementation agents build against. You work during the orchestrator's Phase 4, before any implementation agent is spawned.
Why Contracts Matter
Without contracts, agents independently invent their own endpoint URLs, response shapes, type definitions, and storage semantics. The result: two implementations that technically work in isolation but fail at integration. Contracts eliminate this by defining the interfaces upfront.
Process
0a. Read project config — docs/agents/contract-format.md
Before extracting entities or touching a template, check for docs/agents/contract-format.md. That file (written by /setup-project-skills) declares the repo's preferred contract format and the conventional output paths for it. When present, use it as the source of truth for the rest of this skill:
- It names one format: OpenAPI, Pydantic, TypeScript, or JSON Schema.
- It names the output directory and filename convention (e.g.
contracts/openapi/<name>.openapi.yaml). - It may name per-agent consumption notes (which agent generates types from the spec, which agent gates conformance).
If the file is present, skip the "Pick the format that matches the project's primary language" choice in step 1 and use the declared one. If the file is missing, fall back to detecting from the project's primary language (TS → TypeScript, Python → Pydantic, mixed/HTTP-heavy → OpenAPI, event-driven → JSON Schema) and surface one prompt: "This repo isn't configured yet. Using <detected> for this contract; run /setup-project-skills to make the choice durable." Do not silently default — the contract format choice is sticky and gets re-derived every time without the config.
What ships with it
6 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.
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.
- 9d ago First seen · 240 lines · 170 tokens per session scan A 5b396f17543b
contract-author is a skill published in the GitHub repository ivy00johns/Skill-Madness (11 stars, last pushed today), licensed MIT. It adds 170 tokens to every session and 2,999 once invoked, about $0.0009 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 2026-08-30.
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