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 spec-writergit 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/spec-writer)<a href="https://agentmods.dev/skills/dayvisonassis/sdd-skills/spec-writer"><img src="https://agentmods.dev/badge/skills/dayvisonassis/sdd-skills/spec-writer/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/spec-writer"><img src="https://agentmods.dev/badge/skills/dayvisonassis/sdd-skills/spec-writer.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 | $0.00072 | $0.07699 |
| Opus 5 | $0.00036 | $0.03850 |
| Sonnet 5 | $0.00014 | $0.01540 |
| Haiku 4.5 | $0.00007 | $0.00770 |
Grade A, and why
spec-writer 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 — 483 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Feature Specs Writer
Generate implementation-ready technical specifications based on the project's PRD and existing codebase patterns. Besides spec.md and plan.md, it produces a third artifact, contract.md — the operational contract consumed by implement-feature (which must satisfy it) and by evaluator (which validates against it).
Base docs (in this package):
https://github.com/dayvisonassis/sdd-skills/blob/main/docs/Contrato_de_Feature.md(contract structure),https://github.com/dayvisonassis/sdd-skills/blob/main/docs/Como_criar_gates.md(gates), andhttps://github.com/dayvisonassis/sdd-skills/blob/main/docs/Fluxo_SDD_e_Implementacao_das_Skills.md(full flow). Start withhttps://github.com/dayvisonassis/sdd-skills/blob/main/docs/GUIA_DO_WORKFLOW.mdfor how the skills fit together.
The skill has two modes:
- Single-feature mode (default): operates on one feature at a time, identified by its PRD feature ID (F01, F02...), with an interactive interview (Steps 1–6 below).
- Batch mode: operates on multiple features from the same wave in parallel, auto-accepting all interview recommendations. Activated automatically when the input contains multiple IDs, a wave reference, or a mix. See the Batch Mode section near the end of this file.
Output: THREE files are required:
spec.md- Technical specification (7 sections)plan.md- Implementation plan (phases and steps)contract.md- Operational contract (environment, quality gates, coverage manifest, observable criteria)
Output location: docs/<feature-id>-<kebab-name>/{spec.md,plan.md,contract.md}
- The
<kebab-name>is derived from the feature's name in the PRD Section 6 (lowercase, spaces → hyphens, special characters removed). Example:F03. Video Upload→docs/F03-video-upload/.
Execution Steps (6 Steps)
Note: These are internal agent execution steps. The OUTPUT plan document will have 1-5 phases based on feature complexity.
Step 1: Resolve Input and Pre-Analysis
What ships with it
2 files 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 · 483 lines · 72 tokens per session scan A e9207d1767aa
spec-writer is a skill published in the GitHub repository dayvisonassis/sdd-skills (1 stars, last pushed 13d ago), licensed MIT. It adds 72 tokens to every session and 7,699 once invoked, about $0.0004 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.
Other skills, from other repositories
exploratory-data-analysis
Perform bounded, local exploratory analysis of explicitly supported scientific files. Use for redacted CSV/TSV/JSON profiles; optional NumPy, HDF5, FASTA/FASTQ, and basic image metadata inspection; missingness/leakage audits; outlier and transformation sensitivity; and rigorous EDA report scaffolds. Other domain…
google-ads-audit
Google Ads account audit and business context setup. Run this first — it gathers business information, analyzes account health, and saves context that all other ads skills reuse. Trigger on "audit my ads", "ads audit", "set up my ads", "onboard", "account overview", "how's my account", "ads health check", "what should…
data-charts-tako
Search and visualize the world's data - get charts, insights, and embeddable knowledge cards for finance, economics, demographics, sports, and more.
webhook-management
Configure and validate CCAM webhook targets across supported chat, incident, automation, and generic providers. Use when listing provider requirements, creating or updating a target, scoping it to alert rules, sending a test notification, reviewing delivery history, or deleting a target.
gesellschaftsrechtliche-satzungen-agb
Für Gesellschaftsrechtliche Satzungen AGB Abgrenzung: ordnet Norm, Beweislast und Gegenargument; Ergebnis: Prüfprodukt mit Risiko und nächstem Schritt. Fachgebiet: AGB-Recht-Prüfer. Route: gesellschaftsrechtliche-satzungen-agb.
master-yinguang
A reference-based assistant for questions about Yinguang and Pure Land Buddhism, a Buddhist tradition focused on faith, ethical living, and practice connected with rebirth in the Pure Land. It can answer in Yinguang’s historical teaching style.