contract

A shared format for describing what a sub-agent should do, what it receives, what it must return, and what it must avoid.

In plain words
What is it for?
Use it when dispatching sub-agents for software, research, design, business, or other tasks that need structured results.
Why use it?
It makes delegated work easier to compare and validate by requiring consistent fields and explicit handling of failures.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/griffinwork40/agent-framework/contract
Any agent
npx skills add griffinwork40/agent-framework --skill contract
Clone the repo
git clone --depth 1 https://github.com/griffinwork40/agent-framework

Made for: Claude Code, Codex.

Per session 29 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 708 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 100% copy Near-identical to another mod 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.

ModelPer sessionOnce invoked
Fable 5 $0.00029 $0.00708
Opus 5 $0.00015 $0.00354
Sonnet 5 $0.00006 $0.00142
Haiku 4.5 $0.00003 $0.00071

Measured 2d ago against content hash 0ea822d8124f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

contract 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 2d 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.

Origin

This is a copy

100% identical to contract — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

skills/contract/SKILL.md · 38 lines

How it starts

The opening of the file, as written. The whole thing — 38 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Contract

For each sub-agent you plan to dispatch, define a schema before the call:

  • goal — one-sentence objective
  • inputs — data/context the sub-agent receives
  • artifacts — named structured fields expected back (not freeform prose)
  • non_goals — what the sub-agent must NOT do
  • failure_modes — how to report blocked or partial work
  • domain (optional) — the knowledge domain for this task. Guides how research, specification, and verification adapt. Common values: software, research, design, business — but any freeform string works (e.g., healthcare, legal, education). When omitted, infer from context: git repo present → software; PDFs/papers/citations in working directory → research; design files/brand assets → design; financial models/strategy docs → business. Default fallback: software.

Embed the schema at the top of every sub-agent's prompt and require results in that exact shape. Instruct each sub-agent explicitly: "Return ONLY the schema fields. No preamble, no analysis prose, no explanation — begin your response with the first schema field." When sub-agents return, validate field-by-field. If any artifact is missing, malformed, or wrapped in prose, re-dispatch only the failing sub-agent with the gap cited. Merge only schema-valid responses.

Also instruct each sub-agent to stop on non-convergence: if repeated attempts at the same sub-goal stop making progress after a few tries, do not keep retrying — return the best partial result through the schema's designated failure/partial channel (failure_modes, or whatever blocked/unverified field that agent's schema defines), naming what could not be resolved. Activity is not progress.

Epistemic confidence

Recommended for all sub-agents. Add to your return schema:

  • confidence — low / medium / high — how confident is the sub-agent in the completeness and accuracy of its findings?
  • coverage_gaps — what the sub-agent couldn't access, verify, or search (e.g., proprietary databases, paywalled sources, unpublished practitioner knowledge, subjective judgment areas)
  • boundary_flag — if the sub-agent hit an epistemic boundary, name it: non-falsifiable (claim can't be tested), low-coverage (search was limited), tacit-knowledge (unwritten knowledge required), unprecedented (genuinely novel, no baseline), time-sensitive (answer depends on current state), or none
  • recommended_action — what should happen next: proceed (findings solid, move ahead), human-gate (pause for human judgment before acting), re-retrieve (try different search strategy or sources), elicit (generate prompts to validate with domain experts)

Read the full file on GitHub · 38 lines

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.

  1. 2d ago First seen · 38 lines · 29 tokens per session scan A 0ea822d8124f

Subscribe to this mod's changes

contract is a skill published in the GitHub repository griffinwork40/agent-framework (23 stars, last pushed 7d ago), licensed Apache-2.0. It adds 29 tokens to every session and 708 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to contract, differing in 0 lines, and is treated as a copy.

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