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 dayvisonassis/sdd-skills --skill implement-featuregit clone --depth 1 https://github.com/dayvisonassis/sdd-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/dayvisonassis/sdd-skills/implement-feature)<a href="https://agentmods.dev/skills/dayvisonassis/sdd-skills/implement-feature"><img src="https://agentmods.dev/badge/skills/dayvisonassis/sdd-skills/implement-feature/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/dayvisonassis/sdd-skills/implement-feature"><img src="https://agentmods.dev/badge/skills/dayvisonassis/sdd-skills/implement-feature.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 | $0.00094 | $0.08876 |
| Opus 5.5 | $0.00038 | $0.03550 |
| Sonnet 5.5 | $0.00019 | $0.01775 |
| Haiku 4.5 | $0.00009 | $0.00888 |
Grade A, and why
implement-feature 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 16d 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 — 480 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Implement Feature
Autonomously implement a feature from its existing spec.md + plan.md + contract.md. It implements phase-by-phase with per-phase commits, retry policy, and a final verification/AC report, and is contract-aware — it must satisfy the contract's environment, quality gates, and observable criteria, and it records the feature's state in progress.json so the evaluator can pick it up.
Base docs (in this package):
https://github.com/dayvisonassis/sdd-skills/blob/main/docs/Contrato_de_Feature.md,https://github.com/dayvisonassis/sdd-skills/blob/main/docs/Como_criar_gates.md,https://github.com/dayvisonassis/sdd-skills/blob/main/docs/ARQUITETURA_DAS_SKILLS.md(flow + progress.json schema). Start withhttps://github.com/dayvisonassis/sdd-skills/blob/main/docs/GUIA_DO_WORKFLOW.mdfor how the skills fit together.
INPUT
Free-form. The skill figures out what was passed. Any combination works:
- A feature identifier:
F09,Video Upload, or similar. - A feature folder:
docs/F09-in-video-transcription-search/,./F09/, etc. - A file inside the feature folder:
docs/F09-in-video-transcription-search/spec.md. - A PRD path:
@docs/PRD.md,docs/PRD.md,@PRD.md. - Extra natural-language instructions appended anywhere (see Overrides).
The skill needs to locate three feature files and one reference source:
spec.md,plan.md, andcontract.mdfor the target feature. If the input points to a folder, look inside. If it points to a file, look in its parent folder. If it points to an ID or name, search underdocs/for a folder matching<ID>-*or whose name kebab-cases to the given name.- The PRD. If explicitly passed, use it. Otherwise, auto-discover:
docs/PRD.md→PRD.md→ any top-level*.mdwhose content reads like a product spec. If none found, abort. If multiple are plausible, abort and list them.
If contract.md is missing, the feature was spec'd without a contract. Abort: "contract.md missing in <folder> — regenerate the spec with spec-writer." (Do not silently proceed without the contract.)
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.
- 16d ago Changed · +32 lines 36c29807f9dd
- 18d ago Changed · +7 lines · +3 tokens per session 1b1f6e3dfb28
- 25d ago Changed · -3 lines bc51a3504939
- 29d ago Changed · +16 lines a560a77bca9e
- 1mo ago Changed · +37 lines · +3 tokens per session 8c9c52e5018a
- 2mo ago First seen · 391 lines · 88 tokens per session scan A ada36d8ffdcb
implement-feature is a skill published in the GitHub repository dayvisonassis/sdd-skills (3 stars, last pushed 16d ago), licensed MIT. It adds 94 tokens to every session and 8,876 once invoked, about $0.0004 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 2026-08-31.
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