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 ALTEN-group/coding-pal --skill contract-compatgit clone --depth 1 https://github.com/ALTEN-group/coding-palWrote 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/alten-group/coding-pal/contract-compat)<a href="https://agentmods.dev/skills/alten-group/coding-pal/contract-compat"><img src="https://agentmods.dev/badge/skills/alten-group/coding-pal/contract-compat/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/alten-group/coding-pal/contract-compat"><img src="https://agentmods.dev/badge/skills/alten-group/coding-pal/contract-compat.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 | $0.00078 | $0.00635 |
| Opus 5.5 | $0.00031 | $0.00254 |
| Sonnet 5.5 | $0.00016 | $0.00127 |
| Haiku 4.5 | $0.00008 | $0.00064 |
Grade A, and why
contract-compat 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 3d 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 — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Contract Compat
Deterministic Contract & Schema Compatibility gate. It compares the released contract (base) with the changed contract (head) and prints every change as BREAKING or compatible. A breaking public contract is a Critical blast radius, so it only passes with a signed decision record.
When to Use This Skill
- A change touches an OpenAPI document or a JSON Schema that other systems consume.
- CI (Prove) must block a pull request that removes an operation or response, removes or retypes a response property, adds a required request input, or adds security to an operation.
- A breaking change is intended and must be released through an Architect-signed decision record.
Path resolution
Resolve references/ and scripts/ relative to this skill's install directory (the folder that contains this SKILL.md), not the consumer repository root or the current shell cwd. If the skill was installed under .agents/skills/contract-compat/ or .claude/skills/contract-compat/, use that base path. Run the script from the repository root and write <skill-dir> as that install path.
Workflow
- Read
references/contract-compat-contract.mdnow. It is the authoritative source for what counts as breaking, supported documents, output format, and the decision-record rule. - Produce JSON for both sides. YAML, Swagger 2.0, external
$ref, and Pact are not supported: convert or bundle first.
git show origin/main:openapi.json > base.json
- Run the gate from the repository root:
node <skill-dir>/scripts/contract-compat.mjs --base base.json --head openapi.json
# Intended breaking change, released by an Accepted decision record signed by the Architect
node <skill-dir>/scripts/contract-compat.mjs --base base.json --head openapi.json \
--allow-breaking docs/decisions/0007-remove-legacy-role.md
- Treat a nonzero exit as a failed gate. Restore compatibility (keep the old field, make the new one optional, add a new version). If the break is intended, ask the Architect for a decision record. The AI may draft it, but only a person signs it.
What ships with it
4 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.
- 3d ago First seen · 47 lines · 78 tokens per session scan A b384df0d1cb4
contract-compat is a skill published in the GitHub repository ALTEN-group/coding-pal (5 stars, last pushed 5d ago), licensed MIT. It adds 78 tokens to every session and 635 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 2026-10-14.
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