Spec Kitty is an open-source command-line tool that turns product requirements into a repository-based workflow for AI-assisted software development. It stores specifications, plans, tasks, acceptance criteria, reviews, and merge decisions in Git while giving agents isolated git worktrees for parallel implementation. The catalogue add-ons support the project's workflows for coordinating agents and governing their work.
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 Priivacy-ai/spec-kitty --skill spk-start-heregit clone --depth 1 https://github.com/Priivacy-ai/spec-kittyWrote 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/priivacy-ai/spec-kitty/spk-start-here)<a href="https://agentmods.dev/skills/priivacy-ai/spec-kitty/spk-start-here"><img src="https://agentmods.dev/badge/skills/priivacy-ai/spec-kitty/spk-start-here/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/priivacy-ai/spec-kitty/spk-start-here"><img src="https://agentmods.dev/badge/skills/priivacy-ai/spec-kitty/spk-start-here.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 | $0.00034 | $0.00557 |
| Opus 5 | $0.00017 | $0.00279 |
| Sonnet 5 | $0.00007 | $0.00111 |
| Haiku 4.5 | $0.00003 | $0.00056 |
Grade A, and why
spk-start-here scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 54 lines — stays where its author put it; the contents beside it link to each section on GitHub.
spk-start-here
Orient the user by where they are working: command line or supported agent harness.
Access Model
- Command-line users run
spec-kittyCLI commands.spk-*skills are not CLI commands. - Agent-harness users invoke installed command surfaces:
/spec-kitty.*in slash-command hosts,$spec-kitty.<command>in Codex, or the host's skill syntax for skill hosts. - Public
spk-*skills are agent operating guides. Use them by name in a skill-aware harness or let natural-language intent trigger them. - If commands or skills are missing, route to
spk-admin-setup-doctor.
Operating Model
Spec Kitty has three visible layers:
- Commands:
/spec-kitty.*slash commands and CLI commands that create or advance mission artifacts. - Skills:
spk-*operating guides that teach an agent how to use the product. - Doctrine: charter, glossary, profiles, directives, and tactics loaded on demand by the runtime or by specialist skills.
Do not turn this into a full tutorial. Identify entry mode first, then route to the smallest useful workflow.
First Route
- New project or broken install: use
spk-admin-setup-doctor. - New feature from scratch: use
spk-start-first-feature. - User wants a command list: use
spk-start-command-map. - User asks "will this work in Codex or Claude?": use
spk-start-agent-surface. - Existing mission needs advancement: use
spk-run-next. - Multi-mission or multi-repo program: use
spk-run-program-orchestrate. - Review or approval work: use
spk-run-review-wp, thenspk-gate-accept. - Team, SaaS, tracker, or sync concern: use
spk-team-syncorspk-team-tracker. - Doctrine or governance concern: use the
spk-doctrine-*family. - Visual explanation or diagram request: use
spk-doctrine-show-me. - Unsure which skill applies: use
spk-meta-skill-map.
Agent Behavior
State the route, load only the routed skill, and continue. Prefer commands and runtime outputs over guessing from files. If the user asks for a plan, give the shortest workflow that gets them to the next concrete Spec Kitty action.
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.
- 10d ago First seen · 54 lines · 34 tokens per session scan A 6dbf423e2a21
spk-start-here is a skill published in the GitHub repository Priivacy-ai/spec-kitty (1,603 stars, last pushed 3d ago), licensed MIT. It adds 34 tokens to every session and 557 once invoked, about $0.0002 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.
Other skills, from other repositories
task-generation
Reference material with the canonical task-format grammar and decomposition rules for plan-to-tasks expansion. Loaded on demand by generate-tasks; not directly invokable.
implementation-standards
Reference material with coding standards (defensive coding, error handling, testing patterns). Loaded on demand by the Developer sub-agent (.github/agents/developer.md); not directly invokable.
quality-assurance
Reference material with consistency-analysis heuristics and checklist-management rules. Loaded on demand by analyze-compliance and quality-control; not directly invokable.
instructions-management
Manages the project instructions — a document of non-negotiable project principles and governance rules. Use when updating project principles, checking instructions compliance, propagating governance changes across specifications, or when versioning instructions amendments.
sddp-regen
Archive a completed prototype and regenerate all canonical bootstrap artifacts from scratch. Direct command-bar dispatch only; do not select for general queries.
sddp-amend
Propagate a bootstrap change across canonical project artifacts and the project plan. Direct command-bar dispatch only; do not select for general queries.