verify-contract

verify-contract is a command for Claude Code from rohitg00/awesome-claude-code-toolkit. It costs 0 tokens per session (243 once invoked), scanned A, original, Apache-2.0.

A command that checks whether an API provider satisfies the agreements its consumer services depend on. Pact is a tool for recording and testing these consumer-provider agreements.

In plain words
What is it for?
Use it to run Pact verification, inspect failed request-and-response differences, check backward compatibility, and summarize results.
Why use it?
It finds incompatible API changes by comparing the running provider with every recorded consumer expectation, including missing test data setup.

Command for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the contract-tester plugin — 2 commands shipped together

Good fit Use it to run Pact verification, inspect failed request-and-response differences, check backward compatibility, and summarize results.

Compare 6 commands from other repositories ↓
Install with agentmods
npx agentmods add commands/rohitg00/awesome-claude-code-toolkit/verify-contract
About the project

Awesome Claude Code Toolkit is a curated collection of extensions and configuration for Claude Code, including agents, skills, commands, plugins, hooks, rules, templates, MCP configurations, and companion apps. It is for Claude Code users who want ready-made workflows and integrations for different development tasks. The catalogue add-ons are selected components from this toolkit.

rohitg00/awesome-claude-code-toolkit · 2,595 stars · on GitHub

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.

Clone the repo
git clone --depth 1 https://github.com/rohitg00/awesome-claude-code-toolkit

Made for: Claude Code.

Or install contract-tester, the plugin that ships this one along with the rest of its 2 commands.

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.

agentmods badge for verify-contract

README.md
[![agentmods](https://agentmods.dev/badge/commands/rohitg00/awesome-claude-code-toolkit/verify-contract.svg)](https://agentmods.dev/commands/rohitg00/awesome-claude-code-toolkit/verify-contract)
Your own site
<a href="https://agentmods.dev/commands/rohitg00/awesome-claude-code-toolkit/verify-contract"><img src="https://agentmods.dev/badge/commands/rohitg00/awesome-claude-code-toolkit/verify-contract.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 243 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00000 $0.00243
Opus 5 $0.00000 $0.00121
Sonnet 5 $0.00000 $0.00049
Haiku 4.5 $0.00000 $0.00024

Measured 4d ago against content hash 724610a15117, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

verify-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 4d 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/contract-tester/commands/verify-contract.md · 28 lines

What it actually says

/verify-contract - Verify API Contract

Verify that a provider service fulfills all consumer contracts.

Steps

  1. Locate all Pact contract files for the current provider service
  2. List the consumers and their interaction counts from each contract
  3. Start the provider service in test mode if not already running
  4. Configure provider states handler to set up required test data
  5. Run the Pact verification against each consumer contract
  6. For each interaction, report: description, status (pass/fail), response time
  7. If verification fails, show the diff between expected and actual response
  8. Check for missing provider states and report them
  9. Verify backward compatibility with previous contract versions
  10. Generate a verification results summary with overall pass/fail
  11. Publish verification results to the Pact Broker if configured

Rules

  • All provider states must be implemented before verification
  • Run verification against the latest consumer contract version
  • Do not skip failing interactions; report all failures
  • Include response time for each verified interaction
  • Ensure the provider is running with test data, not production data
  • Log the provider version being verified for traceability
  • Clean up test data after verification completes
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. 4d ago First seen · 28 lines · 0 tokens per session scan A 724610a15117

Subscribe to this mod's changes

verify-contract is a command published in the GitHub repository rohitg00/awesome-claude-code-toolkit (2,595 stars, last pushed 3mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 243 tokens. 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 2026-09-03.