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 andrewsrigom/agent-skills --skill write-decision-complete-feature-specgit clone --depth 1 https://github.com/andrewsrigom/agent-skillsWrote 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/andrewsrigom/agent-skills/write-decision-complete-feature-spec)<a href="https://agentmods.dev/skills/andrewsrigom/agent-skills/write-decision-complete-feature-spec"><img src="https://agentmods.dev/badge/skills/andrewsrigom/agent-skills/write-decision-complete-feature-spec/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/andrewsrigom/agent-skills/write-decision-complete-feature-spec"><img src="https://agentmods.dev/badge/skills/andrewsrigom/agent-skills/write-decision-complete-feature-spec.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 | $0.00060 | $0.00655 |
| Opus 5 | $0.00030 | $0.00328 |
| Sonnet 5 | $0.00012 | $0.00131 |
| Haiku 4.5 | $0.00006 | $0.00065 |
Grade A, and why
write-decision-complete-feature-spec 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 9d 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 — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Write Decision Complete Feature Spec
Use this skill when the team needs a spec that closes decisions before implementation, not a polished document full of unresolved choices.
Scope
- feature specs before implementation
- reducing ambiguity before coding starts
- locking scope, success criteria, and boundaries
- identifying missing decisions that would otherwise be invented during implementation
- turning vague requests into implementation-ready specs
Default path
- State the feature goal in plain language.
- Name the success criteria and who will judge them.
- Define the user-facing behavior and the main flow first.
- Lock scope, non-goals, and ownership boundaries.
- Identify high-risk ambiguities:
- data shape
- permissions
- failure behavior
- loading and empty states
- rollout or migration impact
- Resolve those ambiguities in the spec instead of leaving them to implementation.
- End with concrete acceptance criteria and verification steps.
When to deviate
- Keep the spec lightweight when the feature is tiny and the boundary is already obvious.
- Split the work into multiple specs if one document is trying to cover unrelated surfaces.
- Route to
request-refactor-planinstead when the work is primarily structural rather than behavioral. - Route to
tddonce the contract is already stable and the next problem is implementation sequencing.
Guardrails
- Do not call a spec complete if the implementer still has to choose core behavior.
- Prefer decisions over option lists once enough context exists.
- Keep the spec behavior-first; do not start with file layout or implementation trivia.
- Separate in-scope decisions from future ideas and nice-to-haves.
- Make non-goals explicit so the spec cannot silently expand during delivery.
Avoid
- specs that mostly restate the prompt without making decisions
- “TBD” in core behavior, permissions, or error handling
- mixing rollout notes, architecture notes, and product behavior into one vague blob
- turning the spec into a task list before the contract is actually stable
- using broad phrases like “handle edge cases” without naming the actual cases
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.
- 9d ago First seen · 84 lines · 60 tokens per session scan A baf3cda107f5
write-decision-complete-feature-spec is a skill published in the GitHub repository andrewsrigom/agent-skills (2 stars, last pushed 5mo ago), licensed MIT. It adds 60 tokens to every session and 655 once invoked, about $0.0003 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 2026-08-31.
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