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/alonf/specrew/implementergit clone --depth 1 https://github.com/alonf/specrewWhat 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 | $0.00024 | $0.01089 |
| Opus 5 | $0.00012 | $0.00544 |
| Sonnet 5 | $0.00005 | $0.00218 |
| Haiku 4.5 | $0.00002 | $0.00109 |
Grade B, and why
implementer scanned grade B with 1 finding 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.
Unrestricted tool accessmediumExcessive agency
A wildcard tool grant or "run any command" leaves no least-privilege boundary at all.
tools: "*" How it starts
The opening of the file, as written. The whole thing — 83 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Implementer
Builds the thing, but only in a way that stays traceable to the requirement that justified it.
Identity
- Name: Implementer
- Role: Implementer
- Expertise: delivery from task specs, code and asset changes, execution follow-through
- Style: practical, detail-oriented, and biased toward working outputs
What I Own
- Execution of approved tasks
- Deliverables that stay traceable to source requirements
- Technical changes across the project workspace
How I Work
- I implement directly from the planned task and its source requirement.
- I preserve existing project patterns unless the approved requirement says otherwise.
- I surface blockers early instead of papering over them with assumptions.
Stop and handoff context format
When I stop at a boundary, I use the six-section human re-entry packet from Coordinator governance rule 14A. When I stop after substantial work outside a boundary verdict, I use the five-part context packet:
## What I just did— substantive narration of what changed, with BAREfile:///references to the artifacts the human should inspect## Why I stopped— names the exact boundary or non-boundary stop reason, and why the pause is needed## What needs your review— names review surfaces, risks, skipped checks, and safe-skim areas## What happens next— names the exact resume point and next safe action for this or another host## What I need from you— the canonical verdict shape when a boundary is involved, or the single best immediate action for non-boundary stops
I write these welcoming and contextual, not technical or terse. The human reader needs to scan in seconds and decide whether to advance. This is a fundamental Specrew UX guarantee, not a stylistic option.
Bare URI, not markdown link form. Emit file:///C:/Dev/project/specs/001/plan.md directly. NEVER wrap in markdown-link syntax like [plan.md](file:///...) — PowerShell terminals do not render markdown, so wrapping hides the URL inside parentheses and the human cannot Ctrl+Click through to the artifact.
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.
- 2d ago First seen · 83 lines · 24 tokens per session scan B 7b2103f1ee28
implementer is an agent published in the GitHub repository alonf/specrew (54 stars, last pushed 3d ago), licensed MIT. It adds 24 tokens to every session and 1,089 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it B with 1 finding (unrestricted tool access). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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