ECC is a toolkit that organizes and improves how coding agents work through skills, memory, security checks, research practices, and related extensions. It is for developers using agents such as Claude Code, Codex, OpenCode, and Cursor.
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.
npx agentmods add commands/affaan-m/ecc/tddgit clone --depth 1 https://github.com/affaan-m/ECCWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/commands/affaan-m/ecc/tdd)<a href="https://agentmods.dev/commands/affaan-m/ecc/tdd"><img src="https://agentmods.dev/badge/commands/affaan-m/ecc/tdd.svg" alt="Measured on agentmods" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00011 | $0.00422 |
| Opus 5 | $0.00005 | $0.00211 |
| Sonnet 5 | $0.00002 | $0.00084 |
| Haiku 4.5 | $0.00001 | $0.00042 |
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 yesterday.
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.
Copies of this mod
What it actually says
TDD Command
Implement the following using strict test-driven development: $ARGUMENTS
TDD Cycle (MANDATORY)
RED → GREEN → REFACTOR → REPEAT
- RED: Write a failing test FIRST
- GREEN: Write minimal code to pass the test
- REFACTOR: Improve code while keeping tests green
- REPEAT: Continue until feature complete
Your Task
Step 1: Define Interfaces (SCAFFOLD)
- Define TypeScript interfaces for inputs/outputs
- Create function signature with
throw new Error('Not implemented')
Step 2: Write Failing Tests (RED)
- Write tests that exercise the interface
- Include happy path, edge cases, and error conditions
- Run tests - verify they FAIL
Step 3: Implement Minimal Code (GREEN)
- Write just enough code to make tests pass
- No premature optimization
- Run tests - verify they PASS
Step 4: Refactor (IMPROVE)
- Extract constants, improve naming
- Remove duplication
- Run tests - verify they still PASS
Step 5: Check Coverage
- Target: 80% minimum
- 100% for critical business logic
- Add more tests if needed
Coverage Requirements
| Code Type | Minimum |
|---|---|
| Standard code | 80% |
| Financial calculations | 100% |
| Authentication logic | 100% |
| Security-critical code | 100% |
Test Types to Include
- Unit Tests: Individual functions
- Edge Cases: Empty, null, max values, boundaries
- Error Conditions: Invalid inputs, network failures
- Integration Tests: API endpoints, database operations
MANDATORY: Tests must be written BEFORE implementation. Never skip the RED phase.
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.
- yesterday First seen · 67 lines · 11 tokens per session scan A 0f57c5163f08
tdd is a command published in the GitHub repository affaan-m/ECC (248,541 stars, last pushed yesterday), licensed MIT. It adds 11 tokens to every session and 422 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 2026-09-03.
Other commands, from other repositories
tdd
Enforce strict TDD workflow - write test first, see it fail, then implement.
tdd
强制执行覆盖率达 80% 以上的测试驱动开发（TDD）工作流.
tdd
Test-driven change — write the failing test first, then implement.
go-test
带有表格驱动测试的 Go TDD 工作流.
lfe-tdd
Red-green-refactor quality pass on code the Builder just wrote. Use in the Builder sub-pipeline after lfe-builder completes implementation.
agileteam
Orchestrate an autonomous, defense-in-depth TDD multi-agent team (requirements → spec-sanity gate → planner → coder/reviewer loop → verification/security/validation/judgment gates → human acceptance → retrospective) to build a feature end-to-end against fully verified, independently validated requirements.