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Agentic TDD (Reticle-powered)

Runs a real red-green-refactor loop against your running app for behaviour unit tests cannot express.

Dev & CodingIntermediate★ 1,153⑂ 169AI score 9/10Last updated: Oct 3, 2026

What it does

  • Forces you to declare the consequence before writing code, e.g. "clicking Deploy POSTs to /api/deploy with 200, fires deploy:started, shows the banner, logs no console errors".
  • Uses Reticle's reticle_act_and_wait({ ref, action, until }) so the expectation is an argument to the action — the oracle cannot be retrofitted after seeing the result.
  • Walks through RED (you must actually see a failure; unknown is not red), GREEN (re-run the same call unchanged), REFACTOR (behaviour-bound predicates survive DOM changes).
  • Saves verified journeys with reticle_flow_save so the loop becomes a regression suite you never hand-wrote.
  • Ranks assertion strength: app-fired signal > state > network > element appearing > absence of console errors.

Who it's for

  • Web/full-stack developers who want TDD on user-facing features without mocks.
  • Anyone burned by an agent loosening assertions to force a green run.
  • Teams already using (or evaluating) the Reticle MCP server.

Examples

  1. New Deploy button: write an allOf predicate (network + signal + element + no console errors), confirm verified: "no", implement the smallest change, rerun the identical call for green.
  2. Refactoring a store: because predicates bind to requests, signals and state paths, restructuring internals keeps the suite green while a DOM-shaped test would falsely break.
  3. Growing a regression suite: TDD a login → checkout journey once, save it as a flow, then verify every saved flow on each subsequent change.

· · · Install guide · · ·

Try it now, no install

Paste this into Claude to use the skill without installing anything.

Read the instructions in this file and follow them to help me:
https://raw.githubusercontent.com/reticlehq/reticle/HEAD/skills/agentic-tdd/SKILL.md

What I want: (describe your task here)

If Claude can't open the link, open it yourself and paste the contents instead.

↓ If it works for you, download the ZIP below and install it. Then it runs on its own — no pasting each time.

Install in the Claude app (no terminal)
  1. Download the ZIP with the button below.
  2. In Claude, open Settings → Capabilities and turn on 'Code execution and file creation'. (one time)
  3. Go to Customize → Skills → + → 'Upload a skill' and upload the ZIP.
↓ Download ZIP
Install in Claude Code

Let Claude do it — paste this into Claude Code

Install the skill I found on Claude Skill Mart.
Copy the skills/agentic-tdd folder from the GitHub repo reticlehq/reticle into my ~/.claude/skills/agentic-tdd/.
When it's done, tell me in one line what this skill can do.

Install with a command instead

git clone https://github.com/reticlehq/reticle.git && mkdir -p ~/.claude/skills && cp -r reticle/skills/agentic-tdd ~/.claude/skills/

⚠ This is a third-party skill. Check the source repository before installing.

  1. Open a terminal.
  2. Clone the repository: git clone https://github.com/reticlehq/reticle.git
  3. Create the skills folder: mkdir -p ~/.claude/skills
  4. Copy the skill: cp -r reticle/skills/agentic-tdd ~/.claude/skills/
  5. If Reticle is not installed yet: RETICLE_INSTALL_SOURCE=npx_skill npx @reticlehq/server@latest init
  6. Confirm the setup using the install-and-verify skill from the same repo.
  7. Restart Claude Code, then ask something like "build this feature with agentic TDD" to trigger the skill.
View source on GitHub ↗License: NOASSERTION