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Agent skill

Check Impl Against Spec

by warpdotdev in warpdotdev/common-skills

Compare a pull request's implementation against spec context in speccontext.md and feed any material mismatches into review.json.

MITAuto-check passedDevelopment

Install Check Impl Against Spec

skills CLI
$ npx skills add warpdotdev/common-skills --skill check-impl-against-spec -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install warpdotdev/common-skills check-impl-against-spec --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/warpdotdev/common-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/check-impl-against-spec .claude/skills/check-impl-against-spec && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
check-impl-against-spec
GitHub stars
606
Used in
1 other repo
Token cost
~620 tokens
SKILL.md length
310 words
Files
1
Skills in repo
28
Repo updated
First seen
Licence
MIT

At a glance

Compare a pull request's implementation against spec context in speccontext.md and feed any material mismatches into review.json.

  • Works in 4 steps: Read spec_context.md and extract the… → Compare those commitments against the… → Treat small implementation-level… → …
  • Tasks that involve Pull requests
  • SKILL.md covers Goal, Inputs, Process and Outputs, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Check Impl Against Spec is an agent skill from warpdotdev/common-skills. Compare a pull request's implementation against spec context in speccontext.md and feed any material mismatches into review.json. Use during PR review when approved or repository spec context is available.

Its SKILL.md is about 620 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Pull requests. The licence is MIT.

When your agent uses it

  • Tasks that involve Pull requests

Example prompts

  • “/check-impl-against-spec”

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Read spec_context.md and extract the concrete commitments it makes
  2. Compare those commitments against the actual implementation in pr_diff.txt and the checked-out files.
  3. Treat small implementation-level adjustments as acceptable when they preserve the spec's intent. Do not flag harmless differences in…
  4. Flag a mismatch only when it is material, such as

What it can do on your machine

Read from SKILL.md and the folder at commit 69b4753. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Check Impl Against Spec loads about 620 tokens when it runs. Until then it costs about 58 tokens; SKILL.md has 310 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~58
When it runs · the whole SKILL.md, loaded when a task matches
~620

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from warpdotdev/common-skills at commit 69b4753, republished under its MIT licence (© warpdotdev). 310 words, ~620 tokens.

Download SKILL.mdSave it as .claude/skills/check-impl-against-spec/SKILL.md (or your agent's skills folder).
name
check-impl-against-spec
description
Compare a pull request's implementation against spec context in spec_context.md and feed any material mismatches into review.json. Use during PR review when approved or repository spec context is available.

Check implementation against spec

Use this skill only when spec_context.md exists during PR review.

Goal

Determine whether the implementation in the checked-out PR materially matches the approved spec context. This is a supplement to the normal code review, not a separate output.

Inputs

  • spec_context.md contains the spec context to compare against. It may include both product spec content (intended behavior, acceptance criteria) and tech spec content (implementation details, file changes).
  • pr_diff.txt contains the annotated diff for the PR.
  • pr_description.md may contain additional scope or rationale.
  • The working tree contains the PR branch contents.

Process

  1. Read spec_context.md and extract the concrete commitments it makes:
    • required behaviors (from the product spec)
    • required files or subsystems to change (from the tech spec)
    • stated constraints
    • required follow-up steps, validation, or migrations
  2. Compare those commitments against the actual implementation in pr_diff.txt and the checked-out files.
  3. Treat small implementation-level adjustments as acceptable when they preserve the spec's intent. Do not flag harmless differences in naming, structure, or low-level technique.
  4. Flag a mismatch only when it is material, such as:
    • required behavior in the product spec is missing
    • the implementation contradicts a spec decision
    • the change introduces significant unplanned scope
    • a required validation, migration, or compatibility step from the tech spec is absent

Outputs

  • Do not create a separate report file.
  • Fold spec-alignment findings into review.json.
  • Put broad spec-drift concerns in the review summary.
  • Add inline comments only when the mismatch can be tied to changed lines in the diff.
  • Treat material spec drift as at least an important concern.
  • If the implementation matches the spec closely enough, do not add comments just to mention alignment.

Boundaries

  • Do not require literal one-to-one implementation of the spec when the PR achieves the same outcome safely.
  • Do not speculate about spec details that are not actually present in spec_context.md.
  • Do not post to GitHub directly.

© warpdotdev, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/check-impl-against-spec of warpdotdev/common-skills.

Open the folder on GitHubat commit 69b4753

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in warpdotdev/common-skills, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Check Impl Against Spec next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Check Impl Against Spec compared with similar skills
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Check PRonyx-dot-app/onyx32k2 repos~2.3kAutomated safety check: PassMIT
Understand Diff AnalysisEgonex-AI/Understand-Anything85k1 repos~1.4kAutomated safety check: PassMIT
PR Design DocOpenHands/OpenHands90k—~2.4kAutomated safety check: PassMIT

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Categories

Questions about Check Impl Against Spec

What does Check Impl Against Spec do?

Compare a pull request's implementation against spec context in speccontext.md and feed any material mismatches into review.json. Check Impl Against Spec is an agent skill from warpdotdev/common-skills.json.

When should I use Check Impl Against Spec?

Check Impl Against Spec fits situations like: tasks that involve Pull requests.

How do I install Check Impl Against Spec in Claude Code?

Run `npx skills add warpdotdev/common-skills --skill check-impl-against-spec -a claude-code`. Or copy the skill folder (.agents/skills/check-impl-against-spec in warpdotdev/common-skills) into .claude/skills/check-impl-against-spec in your project. Claude Code loads it when a task matches its description.

How do I install Check Impl Against Spec in Codex?

Run `npx skills add warpdotdev/common-skills --skill check-impl-against-spec -a codex`. Or copy the skill folder (.agents/skills/check-impl-against-spec in warpdotdev/common-skills) into .agents/skills/check-impl-against-spec in your project. Codex loads it when a task matches its description.

Can I use Check Impl Against Spec in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add warpdotdev/common-skills --skill check-impl-against-spec -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/check-impl-against-spec, .gemini/skills/check-impl-against-spec, .github/skills/check-impl-against-spec and .opencode/skills/check-impl-against-spec in your project.

What does Check Impl Against Spec need to run?

SKILL.md names no scripts, command-line tools or credentials: Check Impl Against Spec is instructions for the agent only.

Does Check Impl Against Spec access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Check Impl Against Spec safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Check Impl Against Spec use?

Check Impl Against Spec is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Check Impl Against Spec use?

About 620 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Check Impl Against Spec?

Skills that share tags, products or a category with Check Impl Against Spec: Finishing a Development Branch (obra/superpowers, 296k stars), PR Babysitter (openinterpreter/openinterpreter, 69k stars), Check PR (onyx-dot-app/onyx, 32k stars) and Understand Diff Analysis (Egonex-AI/Understand-Anything, 85k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Check Impl Against Spec?

warpdotdev (a GitHub organization) maintains it in warpdotdev/common-skills, which has 606 GitHub stars. The repository holds 28 skills in this directory. The repository was last updated on September 30, 2026.

Source: warpdotdev/common-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.