Add installable TUnit documentation routing skill

[thomhurst]

TUnit currently has no installable agent skill. This adds one portable tunit skill that routes coding agents to the relevant Markdown pages on tunit.dev instead of embedding a second copy of the documentation.

The 56-line entry point uses a narrowly scoped activation description, task-specific routes, and llms.txt only when a direct route does not cover the task. It instructs agents to start with one page, reuse documentation already in context, and avoid fetching the full documentation corpus. Explicit routes cover Aspire, ASP.NET Core, Playwright, Testcontainers, AOT/reflection, extensibility, TestContext, diagnostics, and cancellation. Essential TUnit distinctions, package-version checks, and unavailable-documentation handling stay inline.

The README and documentation introduction document preview and installation. A dedicated workflow uses a pinned GitHub CLI to validate metadata and smoke-test local installation. It also builds the documentation and checks skill URLs against the generated pages on skill or documentation changes, catching broken routes before deployment. Weekly and manual runs additionally check the deployed site. Detailed examples remain maintained and validated with the existing documentation.

Validation:

• Skill creator validator and gh skill publish --dry-run ./skills passed.
• All 33 unique live links passed; the 32 documentation pages returned text/markdown, and the referenced Testcontainers section was verified. The documentation build and missing-page/index regression probes passed when adding the route checker; CI checks the expanded routes against generated documentation on this update.
• Local installation and remote preview/installation at the pushed commit passed; installed skill bodies matched the source.
• actionlint and git diff --check passed. Markdown/MDX syntax checks passed for the README and documentation introduction.

Unversioned installation prefers the latest release. Until a release contains this change, users must select tunit@main after merge, or pin the PR commit when testing before merge. No runtime APIs or C# examples changed.

Closes #6821.

Summary by CodeRabbit

• New Features

  • Added a TUnit agent skill for guided testing, migration, troubleshooting, and documentation workflows.
  • Added instructions for previewing and installing the skill with GitHub CLI, including installation targets and network requirements.

• Documentation

  • Documented the agent skill in the README and introductory documentation.
  • Added guidance for version-aware documentation, assertions, fixtures, execution, mocking, and integrations.

• Tests

  • Added scheduled and documentation-triggered validation for skill metadata, installation, documentation links, and deployed routes.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-16T09:54:13.914979Z	f25eb6a	New commits

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📒 Files selected for processing (1)

• skills/tunit/SKILL.md

🚧 Files skipped from review as they are similar to previous changes (1)

• skills/tunit/SKILL.md

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📝 Walkthrough

Walkthrough

Adds an installable TUnit agent skill, installation documentation, and workflow checks for skill metadata, local installation, documentation routes, and deployed documentation routes.

Changes

TUnit agent skill

Layer / File(s)	Summary
Skill content and installation guidance skills/tunit/SKILL.md, README.md, docs/docs/intro.md	Adds TUnit task-routing guidance, documentation links, framework-specific instructions, and GitHub CLI installation commands with installation options and release fallback behavior.

Skill validation

Layer / File(s)	Summary
Skill package validation .github/workflows/agent-skill.yml	Retains pinned GitHub CLI checksum verification, skill metadata validation, and local tunit skill installation checks.
Documentation route validation .github/workflows/agent-skill.yml	Adds documentation-triggered and weekly workflow runs, builds the documentation with Node 24 and frozen Yarn dependencies, checks local routes, and conditionally checks deployed routes with retries.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Merge Risk: 🟡 Moderate · up to f25eb

The workflow’s action reference has not been confirmed immutable; if it still uses the mutable tag, upstream changes could execute in CI. Resolve this before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes satisfy the coding requirements in issue #6821. skills/tunit/SKILL.md provides the installable skill with TUnit-specific routes for project setup, tests, assertions, data, fixtures, life…
Out of Scope Changes check	✅ Passed	The changes remain within issue #6821 scope. The skill implements the requested TUnit agent guidance. The README and introduction updates document discovery and installation. The workflow adds maintai…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding an installable TUnit skill that routes agents to documentation.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/tunit-agent-skill

Warning

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_{A rabbit reads the TUnit guide,
Through linked paths it hops with pride.
The skill is packed, the checks run bright,
Local routes stay clear and right.
Weekly runners guard the way,
Docs and tests now work as one day.}

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[chatgpt-codex-connector]

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Reviewed commit: 1ed0ebfea9

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[greptile-apps]

Greptile Summary

Adds an installable TUnit agent skill that directs coding agents to focused, task-specific documentation instead of embedding the documentation corpus.

• Adds routes for core testing workflows, integrations, extensibility, diagnostics, and execution concerns.
• Documents skill preview and installation in the README and documentation introduction.
• Adds CI validation for skill metadata, local installation, generated documentation routes, and deployed routes.

Confidence Score: 5/5

The PR appears safe to merge; no new actionable failure was found in the expanded documentation routes.

The latest changes add valid, topic-specific documentation routes without introducing an established behavioral failure. The earlier non-blocking findings remain outstanding: workflow actions still use mutable tags, and push runs still use the unique run ID in the concurrency group, preventing superseded push runs from being cancelled.

Files Needing Attention: .github/workflows/agent-skill.yml

Important Files Changed

Filename	Overview
skills/tunit/SKILL.md	Defines the installable skill, selective documentation-routing behavior, task-specific routes, and essential TUnit distinctions.
.github/workflows/agent-skill.yml	Adds skill and documentation-route validation; the two previously reported non-blocking workflow concerns remain unchanged.
README.md	Documents GitHub CLI preview and installation of the TUnit skill.
docs/docs/intro.md	Adds the same skill installation guidance to the documentation introduction.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[TUnit coding task] --> B[Inspect project versions and runner]
    B --> C{Direct task route available?}
    C -->|Yes| D[Fetch one relevant Markdown page]
    C -->|No| E[Search llms.txt selectively]
    E --> D
    D --> F[Apply version-appropriate guidance]
    F --> G[Run focused build or test]

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_{Reviews (3): Last reviewed commit: "docs: add advanced TUnit skill routes" | Re-trigger Greptile}

[coderabbitai]

Actionable comments posted: 1

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Inline comments:
In @.github/workflows/agent-skill.yml:
- Line 78: Update the lychee-action reference in the workflow to use a reviewed
full commit SHA instead of the mutable `@v2` tag, and retain the release version
in an adjacent comment for update tracking.

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• .github/workflows/agent-skill.yml

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[github-actions]

Review

This is a docs/CI-only change (no core engine code touched), so the CLAUDE.md core-engine rules don't apply. Overall the skill design is solid: skills/tunit/SKILL.md routes agents to task-specific documentation pages instead of duplicating API content, and the validate job's pinned-checksum GitHub CLI download is a nice touch for supply-chain hygiene. I verified all 12 topic-route links against the current docs/docs/ tree — they all resolve.

CI: documentation-routes job duplicates deploy-pages-test.yml's build

.github/workflows/agent-skill.yml's new documentation-routes job (checkout → setup-node → yarn install --frozen-lockfile → yarn build, all in docs/) is a line-for-line re-implementation of the same sequence in .github/workflows/deploy-pages-test.yml. Both workflows trigger on pull_request/push for docs/**, so any docs-touching PR now runs two independent full Docusaurus builds in parallel.

Why this matters architecturally, not just as a minor cost issue: the two build steps will drift over time (e.g. deploy-pages-test.yml already restores a lychee link cache and uses --config docs/lychee.toml; the new job doesn't), and any future change to how the site builds (Node version, yarn flags, working directory) needs to be made in two places to stay consistent. A more maintainable approach would be to have documentation-routes consume the artifact deploy-pages-test.yml already produces — e.g. upload docs/build from the existing job and download it in this one (or trigger documentation-routes via workflow_run after the pages-test build completes) — rather than rebuilding the site from scratch a second time. That keeps the build defined once, halves the Docusaurus build cost on docs PRs, and removes the risk of the two build configs silently diverging.

Minor: install instructions duplicated between README.md and docs/docs/intro.md

The new "Install the agent skill" section is copy-pasted near-verbatim into both README.md and docs/docs/intro.md (same heading, same paragraph, same gh skill preview/gh skill install snippet, same --agent/--scope note). Since docs/docs/intro.md is the canonical, deployed source (linked from tunit.dev), consider trimming the README section to a one-line pointer to that page instead of duplicating the full instructions — otherwise a future change to the install flow (e.g. a version bump, a new flag) risks being applied in only one of the two places.

Not flagging as a new issue

CodeRabbit's prior comment suggested pinning actions/checkout, actions/setup-node, and lycheeverse/lychee-action to commit SHAs rather than version tags. This PR's usage (@v7.0.1, @v7.0.0, @v2) is consistent with every other workflow in .github/workflows/, so it isn't a regression introduced here — it's an existing repo-wide convention. Worth revisiting repo-wide if the maintainers want to tighten supply-chain pinning, but not something this PR should be singled out for.

[github-actions]

Code Review

Reviewed the diff for PR #6823 (docs/CI-only change adding an installable TUnit agent skill — no core engine, source-generator, or engine code touched, so the CLAUDE.md core-engine testing rules don't apply here).

Findings

1. Duplicate Docusaurus build pipeline (.github/workflows/agent-skill.yml:56)
The new documentation-routes job re-implements the Docusaurus build (checkout, setup-node@v7.0.0, yarn install --frozen-lockfile, yarn build in docs/) that .github/workflows/deploy-pages-test.yml already performs for the same docs/** path triggers.

• Why it matters: any PR touching docs/** now runs two full, independently-configured Docusaurus builds (double CI time/cost), and the two pipelines can silently diverge — deploy-pages-test.yml restores a lychee cache and runs link checks via --config docs/lychee.toml, while this new job has neither. A future change to Node version, yarn flags, or working directory needs to be applied in both places to stay consistent.
• Suggestion: factor the build into a reusable workflow/composite action (or have agent-skill.yml's route-check job consume the artifact deploy-pages-test.yml already produces) rather than maintaining two copies of the same build steps.

2. Duplicated install instructions (README.md:338 / docs/docs/intro.md:14)
The "Install the agent skill" section (heading, paragraph, gh skill preview/gh skill install snippet, --agent/--scope note) is copied near-verbatim into both files, with neither referencing the other.

• Why it matters: a future edit to the install flow (version bump, renamed flag, removing the @main fallback once a release ships) is easy to apply in only one copy, leaving the other stale.
• Suggestion: keep the canonical instructions in one place (e.g. docs/docs/intro.md) and have the README link to it, or generate both from a shared snippet if the docs site supports includes.

3. README install-section links aren't covered by any link-checker (.github/workflows/agent-skill.yml:83)
The new link-validation steps only glob skills/**/*.md, and link-check.yml only globs docs/docs/**/*.md. The links newly added to README.md (e.g. skills/tunit/SKILL.md, cli.github.com/manual/gh_skill*) aren't checked by either.

• Why it matters: a typo or broken URL introduced later in the README's install section is the one place that no CI job would catch.
• Suggestion: add README.md to the link-check.yml glob (or the new workflow's), or eliminate the gap entirely by resolving finding Retry attribute  #2 above.

Verified as correct (not issues)

• All doc-route links in skills/tunit/SKILL.md resolve against the actual docs/docs/ tree, including the writing-tests/mocking index-page route.
• docs/lychee.toml's exclusion of tunit.dev URLs matches the workflow comment's stated rationale — not reusing it there is intentional, not a bug.
• actions/checkout@v7.0.1, setup-node@v7.0.0, and lycheeverse/lychee-action@v2 pinning matches this repo's existing convention in deploy-pages-test.yml/link-check.yml.

No prior Claude review comments exist on this PR to reconcile against.

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