A small manager for evidence contracts used to track what a development task must prove. It can display contracts, list them, or mark the active one complete or abandoned.

Use it to inspect the active contract, view all contracts, finish a completed contract, or abandon one that is no longer being pursued.

It gives reviewers and automated checks a clear record of which claims a task is expected to support. It prevents changing the task's evidence requirements mid-work.

contract — Skill for Claude Code by ondrej-svec/heart-of-gold-toolkit

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 ondrej-svec/heart-of-gold-toolkit --skill contract

Clone the repo

git clone --depth 1 https://github.com/ondrej-svec/heart-of-gold-toolkit

Made for: Claude Code.

Or install quellis-architect, the plugin that ships this one along with the rest of its 3 skills.

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/ondrej-svec/heart-of-gold-toolkit/contract/github.svg)](https://agentmods.dev/skills/ondrej-svec/heart-of-gold-toolkit/contract)

Your own site

<a href="https://agentmods.dev/skills/ondrej-svec/heart-of-gold-toolkit/contract"><img src="https://agentmods.dev/badge/skills/ondrej-svec/heart-of-gold-toolkit/contract/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/ondrej-svec/heart-of-gold-toolkit/contract"><img src="https://agentmods.dev/badge/skills/ondrej-svec/heart-of-gold-toolkit/contract.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 73 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,329 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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	$0.00073	$0.01329
Opus 5.5	$0.00029	$0.00532
Sonnet 5.5	$0.00015	$0.00266
Haiku 4.5	$0.00007	$0.00133

Measured 2mo ago against content hash 1935d96b8628, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 2mo 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.

plugins/quellis-architect/skills/contract/SKILL.md · 125 lines

How it starts

The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Contract (review / manage evidence contracts)

A small, deliberate management surface for the per-task evidence contracts written by /quellis-architect:plan and consulted by the Stop hook. Reads by default; writes only on explicit subcommands. Authoring new contracts and editing claim shapes is /quellis-architect:plan's job — this skill exists for lifecycle bookkeeping.

Boundaries

This skill MAY: read .quellis/contracts/ files, print contract content, flip status to completed or abandoned on explicit subcommand, delete .quellis/contracts/active.toml when the active contract closes. This skill MAY NOT: edit claim shapes, add or remove [[claim]] blocks, rewrite the pointer to a different task without an activate subcommand (not in V1.1), edit code, run tests.

To change what a contract claims, run /quellis-architect:plan again with the same brainstorm. That rewrites the contract cleanly. Mid-flight claim edits drift from the substrate V1.2 personalization compounds.

Common Rationalizations

Shortcut	Why it fails	The cost
"Just edit claim_regex inline to make the gate pass"	The gate exists because the unrefined claim is dangerous. Tweaking the regex is laundering.	Silent regression on the next agent that inherits the lying contract.
"Mark abandoned to avoid the complete-prompt friction"	`abandoned` is for tasks dropped without finishing. Marking abandoned to skip evidence buries the trail.	Lost compounding signal for V1.2.
"Skip showing the contract — the user knows what's active"	Memory drifts across sessions. A 30-second show is cheap insurance against the user assuming a stale contract.	Stop fires on something the user didn't realize was still active.

Phase 0: Detect the subcommand

Entry: user invoked /quellis-architect:contract [subcommand] [args].

Subcommands:

Subcommand	Args	Action
`show` (default if no arg)	none	Print the active contract; if none, say so.
`list`	none	Print every contract in `.quellis/contracts/`, marking which is active and each one's `status`.
`complete`	none	Mark the active contract `status = "completed"`. Clear `active.toml`. Asks once to confirm.
`abandon`	none	Mark the active contract `status = "abandoned"`. Clear `active.toml`. Asks once to confirm.

Read the full file on GitHub · 125 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.

2mo ago First seen · 125 lines · 73 tokens per session scan A 1935d96b8628

Subscribe to this mod's changes

contract is a skill published in the GitHub repository ondrej-svec/heart-of-gold-toolkit (19 stars, last pushed 1mo ago), licensed MIT. It adds 73 tokens to every session and 1,329 once invoked, about $0.0003 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 2026-08-30.

contract next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
contractondrej-svec/heart-of-gold-toolkit	Skill	19	1mo ago	MIT	A	73	Claude Code
imagegenopenai/codex	Skill	134k	today	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	today	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	today	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	314k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code