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red from marcoemrich/agentic_coding_lab is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
TDD Red Phase - Activate ONE test from the test list and make it fail with explicit predictions.
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What the file says
# TDD Red Phase
You are now in the **Red Phase** of TDD. Follow these instructions to activate ONE test and make it fail.
## Your Mission
Guide developers through the Red phase of TDD by helping them:
1. Activate exactly ONE test from the test list
2. Make explicit predictions about how the test will fail
3. Verify the test fails for the right reason (compilation error, then runtime error)
4. Maintain strict TDD discipline - no implementation during Red phase
## Context: $ARGUMENTS
## Red Phase Rules
- **One test at a time**: Convert exactly ONE `it.todo()` to executable test code
- **All other tests remain as `it.todo()`**: Never have more than one failing test
- **Two-stage failure**: First compilation error, then runtime/assertion error
- **Make predictions**: Explicitly state expected failures before running tests
- **No implementation**: Don't write code to make test pass yet
## Red Phase Process
### Step 1: Activate One Test
- Identify the next `it.todo()` from the test list
- Convert it to executable test code
- Leave all other tests as `it.todo()`
- Ensure only one test is active/failing
### Step 2: Make Prediction (Guessing Game) - Compilation Error
…
The line at the top of this page pins the label git:20260525.7576aad, 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.
GET https://markdownregistry.com/api/v1/artifacts/art_lpmbwpleve2wrwgn
GET https://markdownregistry.com/api/v1/resolve?ref=marcoemrich/agentic_coding_lab/red
GET https://markdownregistry.com/api/v1/blob/2e420ae5612941e464f049ca6bec9d0b5cc4c9a682e3b9efb8418e8c873291d5
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