GSD Pi is a command-line coding agent and project workflow system that plans, implements, verifies, and tracks software work through milestones, tasks, Git worktrees, and stored project notes. It is for developers who want structured, longer-running agent sessions using different model providers. The catalogue entries extend GSD Pi with skills and agents.
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 open-gsd/gsd-pi --skill btwgit clone --depth 1 https://github.com/open-gsd/gsd-piWrote 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/open-gsd/gsd-pi/btw)<a href="https://agentmods.dev/skills/open-gsd/gsd-pi/btw"><img src="https://agentmods.dev/badge/skills/open-gsd/gsd-pi/btw/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/open-gsd/gsd-pi/btw"><img src="https://agentmods.dev/badge/skills/open-gsd/gsd-pi/btw.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 7 Skill grants unrestricted tool access without appropriate constraints. An agent with unfettered tool access can perform arbitrary actions including file modification, network requests, and code execution.Fix: Restrict tool access to only the tools required for the skill's stated purpose. Use an explicit allowlist rather than granting blanket access.
- medium Excessive Agency · line 14 Skill grants unrestricted tool access without appropriate constraints. An agent with unfettered tool access can perform arbitrary actions including file modification, network requests, and code execution.Fix: Restrict tool access to only the tools required for the skill's stated purpose. Use an explicit allowlist rather than granting blanket access.
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 | $0.00053 | $0.00501 |
| Opus 5.5 | $0.00021 | $0.00200 |
| Sonnet 5.5 | $0.00011 | $0.00100 |
| Haiku 4.5 | $0.00005 | $0.00050 |
Grade A, and why
btw 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 21d 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.
What it actually says
- Answer only from information already in the conversation (files read, decisions made, code seen, context established)
- Do NOT use any tools — no Read, no Bash, no Grep, no Search
- If the answer requires reading something new, say so briefly and suggest the user ask as a normal prompt instead
- Keep the response short and direct — one to a few sentences unless the question genuinely needs more
- Do not summarize the main work, ask follow-up questions, or offer to do anything else
- After answering, stop — do not prompt for next steps
<quick_start>
Parse the argument after /btw as the question. Answer it directly from context.
If no argument is provided, ask: "What did you want to know?"
If the question cannot be answered from current context (requires reading a file, running a command, or information not yet in the session), respond with: "I'd need to [read X / run Y / look up Z] to answer that — ask it as a normal prompt when you're ready." </quick_start>
Not a good fit for /btw (suggest normal prompt):
- Questions requiring reading a file not yet seen
- Questions requiring running a command
- Questions needing a multi-step answer or follow-up
- Starting a new task or changing direction
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.
- 21d ago Changed · +1 lines 2a9a755182a3
- 1mo ago First seen · 43 lines · 53 tokens per session scan A b356c51460e3
btw is a skill published in the GitHub repository open-gsd/gsd-pi (1,334 stars, last pushed today), licensed MIT. It adds 53 tokens to every session and 501 once invoked, about $0.0002 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 2026-08-30.
Other skills, from other repositories
gsd-surface
Toggle which skills are surfaced — apply a profile, list, or disable a cluster without reinstall.
gsd-capture
Capture ideas, tasks, notes, and seeds to their destination.
gsd-ns-manage
Invoke this Pi skill with /skill:gsd-ns-manage.
gsd-profile-user
Generate developer behavioral profile and create Claude-discoverable artifacts.
gsd-fast
Execute a trivial task inline — no subagents, no planning overhead.
gsd-ns-ideate
Invoke this Pi skill with /skill:gsd-ns-ideate.