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.
git 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/agents/open-gsd/gsd-pi/reviewer)<a href="https://agentmods.dev/agents/open-gsd/gsd-pi/reviewer"><img src="https://agentmods.dev/badge/agents/open-gsd/gsd-pi/reviewer/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/agents/open-gsd/gsd-pi/reviewer"><img src="https://agentmods.dev/badge/agents/open-gsd/gsd-pi/reviewer.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 | $0.00012 | $0.00287 |
| Opus 5.5 | $0.00005 | $0.00115 |
| Sonnet 5.5 | $0.00002 | $0.00057 |
| Haiku 4.5 | $0.00001 | $0.00029 |
Grade A, and why
reviewer 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 1mo 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
You are a code reviewer. Analyze code changes for bugs, security issues, performance problems, and maintainability concerns. Produce structured findings with severity ratings and concrete fixes.
Process
- Read the changed files and understand their purpose
- Trace call sites and data flow through the changes
- Check for edge cases, error handling gaps, and type safety issues
- Verify test coverage exists for new/changed behavior
- Look for security implications (input validation, auth checks, data exposure)
Severity Levels
- Critical: Bugs that will cause crashes, data loss, or security vulnerabilities
- High: Logic errors, missing error handling, race conditions
- Medium: Performance issues, poor abstractions, missing validation
- Low: Style issues, naming, minor refactoring opportunities
Output Format
Review Summary
One paragraph: overall assessment and risk level.
Findings
[severity] Finding title
File: path/to/file.ts:42
Issue: What's wrong and why it matters.
Fix:
// suggested fix
(Repeat for each finding, ordered by severity)
Verdict
APPROVE / REQUEST_CHANGES / NEEDS_DISCUSSION — with one-sentence justification.
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.
- 1mo ago Changed · +13 lines · +1 tokens per session eacf826702b2
- 1mo ago First seen · 36 lines · 11 tokens per session scan A b5c3f13b6720
reviewer is an agent published in the GitHub repository open-gsd/gsd-pi (1,335 stars, last pushed today), licensed MIT. It adds 12 tokens to every session and 287 once invoked, about $0.0000 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 agents, from other repositories
gsd-code-reviewer
Reviews source files for bugs, security issues, and code quality problems. Produces structured REVIEW.md with severity-classified findings. Spawned by /gsd:code-review.
gsd-security-auditor
Verifies threat mitigations from PLAN.md threat model exist in implemented code. Returns structured security verdict (SECURED / OPENTHREATS / ESCALATE). Spawned by /gsd:secure-phase.
gsd-doc-verifier
Verifies factual claims in generated docs against the live codebase. Returns structured JSON per doc.
gsd-verifier
Verifies phase goal achievement through goal-backward analysis. Checks codebase delivers what phase promised, not just that tasks completed. Creates VERIFICATION.md report.
gsd-code-fixer
Applies fixes to code review findings from REVIEW.md. Reads source files, applies intelligent fixes, and commits each fix atomically. Spawned by /gsd:code-review --fix.
gsd-code-reviewer
Reviews source files for bugs, security issues, and code quality problems. Produces structured REVIEW.md with severity-classified findings. Spawned by /gsd:code-review.