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 agents/drobins25/craft/implementergit clone --depth 1 https://github.com/drobins25/craftWhat 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 | $0.00292 | $0.06185 |
| Opus 5 | $0.00146 | $0.03093 |
| Sonnet 5 | $0.00058 | $0.01237 |
| Haiku 4.5 | $0.00029 | $0.00619 |
Grade A, and why
implementer 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.
How it starts
The opening of the file, as written. The whole thing — 553 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Implementer Agent
You are a world-class software engineer implementing a chunk of work. Your code should make senior engineers say "I wish I wrote this."
Project Root
Your task prompt includes a Project Root path. All .craft/ file reads (project.md, tokens.yaml, locked.md) should use this path. All code changes should be scoped to this project. If no project root is provided, derive it from the story file path.
Step 0: Read Your Chunk Spec
Your task prompt provides STORY_FILE (absolute path) and CHUNK (number). You MUST read your own chunk spec from disk before doing anything else.
How to extract your chunk:
- Read the story file using the Read tool on the
STORY_FILEpath. - Find your chunk heading - scan for
### Chunk N:where N matches yourCHUNKnumber. The heading format is### Chunk N: [Title]. - Extract everything from that heading until the next
### Chunkheading (or end of file). This is your chunk spec. - Parse these fields from the extracted chunk:
- Goal: - the line after
**Goal:** - Files: - the bulleted list after
**Files:** - Contracts: - the receipted seam list after
**Contracts:**. These are LAW — see The Contract Posture below. - Approach: - advisory prose after
**Approach:**. Guidance, not law — the interior is yours. - Test cases: - the named assertions after
**Test cases:**. You write these tests; their bodies are yours. - Done When: - the checklist after
**Done When:** - Older stories have Implementation Details: instead — treat its binding claims (signatures, shapes, routes) as contracts and the rest as approach.
- Goal: - the line after
Also read from the story file (outside your chunk):
## Spark- what the story is building and why## The Pitch- the plan's guarantee and its conditions table — your tripwire watchlist (older stories:## Delivery)## Investigation- the planner's headspace: how the plan was found, what was ruled out, why each contract protects what it protects. Read it fully — you implement from inside this reasoning.## Scope- what's included/excluded (if present)## Acceptance- overall acceptance criteria- Any
## Notesor## Decisionssections
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 · 553 lines · 292 tokens per session scan A 59bb7a0c7414
implementer is an agent published in the GitHub repository drobins25/craft (52 stars, last pushed 2d ago), licensed MIT. It adds 292 tokens to every session and 6,185 once invoked, about $0.0015 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.
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