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.
git 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/checkpoint)<a href="https://agentmods.dev/commands/affaan-m/ecc/checkpoint"><img src="https://agentmods.dev/badge/commands/affaan-m/ecc/checkpoint/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/commands/affaan-m/ecc/checkpoint"><img src="https://agentmods.dev/badge/commands/affaan-m/ecc/checkpoint.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00006 | $0.00329 |
| Opus 5.5 | $0.00002 | $0.00132 |
| Sonnet 5.5 | $0.00001 | $0.00066 |
| Haiku 4.5 | $0.00001 | $0.00033 |
Grade A, and why
checkpoint 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 1mo 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.
Copies of this mod
8 near-identical copies found in the catalogue:
- checkpoint — 100% identical, 2 lines differ
- checkpoint — 98% identical, 2 lines differ
- checkpoint — 97% identical, 2 lines differ
- checkpoint — 94% identical, 2 lines differ
- checkpoint — 94% identical, 2 lines differ
- checkpoint — 94% identical, 2 lines differ
- checkpoint — 94% identical, 2 lines differ
- checkpoint — 94% identical, 2 lines differ
What it actually says
Checkpoint Command
Save current verification state and create progress checkpoint: $ARGUMENTS
Your Task
Create a snapshot of current progress including:
- Tests status - Which tests pass/fail
- Coverage - Current coverage metrics
- Build status - Build succeeds or errors
- Code changes - Summary of modifications
- Next steps - What remains to be done
Checkpoint Format
Checkpoint: [Timestamp]
Tests
- Total: X
- Passing: Y
- Failing: Z
- Coverage: XX%
Build
- Status: PASS: Passing / FAIL: Failing
- Errors: [if any]
Changes Since Last Checkpoint
git diff --stat [last-checkpoint-commit]
Completed Tasks
- Task 1
- Task 2
- Task 3 (in progress)
Blocking Issues
- [Issue description]
Next Steps
- Step 1
- Step 2
Usage with Verification Loop
Checkpoints integrate with the verification loop:
/plan → implement → /checkpoint → /verify → /checkpoint → implement → ...
Use checkpoints to:
- Save state before risky changes
- Track progress through phases
- Enable rollback if needed
- Document verification points
TIP: Create checkpoints at natural breakpoints: after each phase, before major refactoring, after fixing critical bugs.
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.
- 1mo ago First seen · 68 lines · 6 tokens per session scan A 17c275584724
checkpoint is a command published in the GitHub repository affaan-m/ECC (283,276 stars, last pushed 4d ago), licensed MIT. It adds 6 tokens to every session and 329 once invoked, about $0.0000 per session on Opus 5.5. 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
implement
Execute tasks from a track's implementation plan following TDD workflow.
amend-plan
Plan Amend - Discuss and apply amendments to a plan.json implementation plan.
rules
A command for managing coding rules stored in CLAUDE.md, AGENTS.md, and optional project RULES.md files. It can select built-in rules, add personal rules, change settings such as architecture or coverage, and control whether test-driven development (TDD) is required.
traceability-gen
A command that rebuilds a Markdown table linking requirements to project plans and tests. It reads requirement files, plan files, and test markers, then records what is planned or covered.
execute
Execute the next available tracked task with TDD, pre-commit validation, PR creation, AI code review, and issue tracker bridge sync.
dev
You are an experienced Tech Lead overseeing multiple AI Worker Agents on software projects. The user is the PM / product owner. You drive all technical execution and communicate in natural language.