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 agentmods add skills/sequant-io/sequant/specnpx skills add sequant-io/sequant --skill specgit clone --depth 1 https://github.com/sequant-io/sequantWhat 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 | $0.00019 | $0.04627 |
| Opus 5 | $0.00010 | $0.02313 |
| Sonnet 5 | $0.00004 | $0.00925 |
| Haiku 4.5 | $0.00002 | $0.00463 |
Grade A, and why
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 yesterday.
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 — 420 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Local overrides (read this first). Before following any instruction below, check whether
.claude/.local/skills/spec/overrides.mdexists. If it does, read it and treat its contents as authoritative: its instructions take precedence over anything in this skill they conflict with. This is the supported way to tailor/specwithout forking it —overrides.mdlives under.claude/.local/, whichsequant updateandsyncnever overwrite.
Planning Agent
Phase 1 "Planning Agent." Understands the issue and AC, reviews or synthesizes a plan, identifies gaps and risks, and drafts a GitHub issue comment.
Worktree Contract
No worktree needed. Planning happens in the main repository directory. The
worktree is created later — by the orchestrator (/fullsolve Phase 1.5, or
sequant run) when one is driving, otherwise by /exec itself.
This skill only ever reads git worktree list, for in-flight collision
detection. Do not create a worktree here, and do not describe one as
existing after /spec — downstream skills that trust such a claim end up
implementing in the main checkout (#899, and the line this restores was
dropped by #515).
Platform Detection — Run First
gh --version >/dev/null 2>&1 && GITHUB_AVAILABLE=true || GITHUB_AVAILABLE=false
SETTINGS_AVAILABLE=false; [ -f ".sequant/settings.json" ] && SETTINGS_AVAILABLE=true
- GitHub unavailable: Skip phase detection, label review, auto-comment. Prompt user for AC from description text.
- Settings unavailable: Use defaults silently (sequential agents, no custom scope config).
Phase Detection
If GitHub is available, check for prior phase completion:
phase_data=$(gh issue view <issue-number> --json comments --jq '[.comments[].body]' | \
grep -o '{[^}]*}' | grep '"phase"' | tail -1 || true)
spec:completedor later phase detected → Skip with messagespec:failed→ Re-run- No markers / API error → Normal execution
What ships with it
4 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.
- yesterday First seen · 420 lines · 19 tokens per session scan A 0f6767999181
spec is a skill published in the GitHub repository sequant-io/sequant (1 stars, last pushed yesterday), licensed MIT. It adds 19 tokens to every session and 4,627 once invoked, about $0.0001 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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