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 skills add tt-a1i/matt-skills-with-to-goal --skill spec-executorgit clone --depth 1 https://github.com/tt-a1i/matt-skills-with-to-goalWrote 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/skills/tt-a1i/matt-skills-with-to-goal/spec-executor)<a href="https://agentmods.dev/skills/tt-a1i/matt-skills-with-to-goal/spec-executor"><img src="https://agentmods.dev/badge/skills/tt-a1i/matt-skills-with-to-goal/spec-executor/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/skills/tt-a1i/matt-skills-with-to-goal/spec-executor"><img src="https://agentmods.dev/badge/skills/tt-a1i/matt-skills-with-to-goal/spec-executor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00096 | $0.01149 |
| Opus 5 | $0.00048 | $0.00575 |
| Sonnet 5 | $0.00019 | $0.00230 |
| Haiku 4.5 | $0.00010 | $0.00115 |
Grade A, and why
spec-executor 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 12d 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.
How it starts
The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Spec Executor
Implement one approved spec in the forked execution thread. Treat the planning thread as the source of product decisions, keep implementation detail here, and return a compact receipt that can be pasted back.
Resolve the execution contract
- Find the latest
SPEC READYblock in inherited conversation history. Later user corrections override it; older conflicting requirements do not. - Read the complete spec artifact referenced by that block, including tracker comments or directly linked decisions. Do not reconstruct a second long goal.
- Require the route to say that the spec is suitable for forked execution. If it says
to-tickets, contains unresolved product decisions, or cannot fit one implementation context, stop and explain the routing problem. - If no
SPEC READYblock exists, proceed only when the user explicitly identifies an approved spec and asks for its implementation. Otherwise ask for the final source rather than guessing which draft won. - Extract and preserve:
- repository and starting baseline;
- user-visible outcome and acceptance criteria;
- agreed test seam;
- explicit non-goals and workspace boundaries;
- authorization for commit, push, review request, deployment, tracker edits, data changes, and other external effects.
Do not reopen settled product questions. Pause only when the final spec is internally contradictory, conflicts materially with the repository, lacks a required external contract, or requires new authority.
Lock scope before editing
Inspect repository instructions, branch, HEAD, worktree status, recent relevant history, and the current implementation at the agreed seam. Record the actual pre-implementation HEAD as the review fixed point.
Send a short execution lock before substantive edits:
Executing: <one-sentence outcome>
Source: <spec issue, file, or final SPEC READY block>
In scope: <compact list>
Out of scope: <compact list>
Validation: <primary seam and required gates>
External authority: <what is and is not authorized>
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 12d ago First seen · 87 lines · 96 tokens per session scan A 46b32e61914f
spec-executor is a skill published in the GitHub repository tt-a1i/matt-skills-with-to-goal (160 stars, last pushed 15d ago), licensed MIT. It adds 96 tokens to every session and 1,149 once invoked, about $0.0005 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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Turns incidents, near misses, bad handoffs, review surprises, escaped bugs, and signals from real use into lasting fixes to your safeguards. Use after something went wrong or nearly did and a future safeguard should change. Do not use during a live incident, which comes first, or to blame someone.