tdd

A command that guides test-driven development through vertical slices: one test, one implementation, repeated in small steps. It dispatches a tdd-guide agent.

In plain words
What is it for?
Use it to build features by writing one test and its implementation at a time with help from the tdd-guide agent.
Why use it?
It breaks development into focused increments, making it easier to see which requirement is being implemented and tested at each step.

Command

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/4riel/cc-bible/tdd
Clone the repo
git clone --depth 1 https://github.com/4riel/cc-bible
Per session 21 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 226 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00021 $0.00226
Opus 5 $0.00010 $0.00113
Sonnet 5 $0.00004 $0.00045
Haiku 4.5 $0.00002 $0.00023

Measured 2d ago against content hash 8bcc9821b545, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

tdd scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

cc-bible-plugin/commands/tdd.md · 21 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 21 lines · 21 tokens per session scan A 8bcc9821b545

Subscribe to this mod's changes

tdd is a command published in the GitHub repository 4riel/cc-bible (21 stars, last pushed 1mo ago), with no licence file. It adds 21 tokens to every session and 226 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.