tdd-loop SKILL.md skillA
tdd-loop from ramboz/jig is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ramboz/jig/tdd-loop@git:20260917.3412c4dPins git:20260917.3412c4d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ramboz/jig
- Path
hosts/copilot/.github/skills/tdd-loop/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260917.3412c4d, committed Sep 17, 2026
- First version recorded
- Sep 16, 2026
- Size
- 10,922 bytes
- Repository stars
- 7
- License
- MIT
Drive the red-green-refactor loop for any non-trivial code change. Auto-detect the project's test runner (pytest / vitest / jest / node --test), invoke it via the `tdd.py` helper, and act on the normalized exit code. Use when you write a test, TDD this feature, let me test-drive a behaviour, are about to implement [feature], want to run my tests, ask is my coverage complete, or ask are tests green. Do not use for one-off exploratory scripts, throwaway spikes, or pure-documentation edits that…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
> **`$JIG_ROOT`** — jig's runtime root (this plugin's own directory).
> Copilot exposes no plugin-root environment variable, so jig's `SessionStart`
> hook publishes the value into session context. In a fresh shell, resolve it
> with the locator:
> `JIG_ROOT="$(for f in "${COPILOT_HOME:-$HOME/.copilot}"/installed-plugins/*/*/.github/scripts/jig_root.py; do [ -f "$f" ] && python3 "$f" && break; done)"`
> Spec 006 promoted this skill from a dangling auto-install reference to an
> active skill. The deterministic runner detection + subprocess invocation
> live in `tdd.py`; this SKILL.md drives the judgment layer.
## What this skill does
Codifies the red-green-refactor loop that the `implementer` subagent
(`agents/implementer.md`) already encodes as "non-negotiable TDD discipline."
The skill:
- Detects the project's test runner from filesystem signals (one of `pytest`,
`vitest`, `jest`, or Node's built-in `node --test`).
- Invokes the runner as a subprocess against a target, a focused
`--test-path`, or a single `--test` selector.
- Streams the runner's stdout/stderr through to the caller — you see real
output, not a swallowed summary.
…Read the whole file at its exact version.
How to install
mdr add ramboz/jig/tdd-loop@sha256:d61c080a7cc98f10The line at the top of this page pins the label git:20260917.3412c4d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_7ccp7sgazrltq253)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 16, 2026 and Sep 17, 2026, more than one a day.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260917.3412c4d latest | 2026-09-17 | 3412c4d | 10,922 B | A | view · diff |
| git:20260917.3e6faff | 2026-09-17 | 3e6faff | 10,508 B | A | view · diff |
| git:20260916.dc8d453 | 2026-09-16 | dc8d453 | 10,507 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10922 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
ramboz/jig · 7 stars · license MIT · pushed 2026-10-27 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7ccp7sgazrltq253 GET https://markdownregistry.com/api/v1/resolve?ref=ramboz/jig/tdd-loop GET https://markdownregistry.com/api/v1/blob/d61c080a7cc98f10f7f77e5149175174865835372c5fafcbc8aa54923a1f401d
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.