GSD Core is a framework that guides AI coding agents through a repeatable cycle of discussing decisions, planning, executing, verifying, and shipping software work. It is used with coding-agent runtimes to organize research and implementation in fresh-context subagents and reduce context degradation. The catalogue entries are its skills, agents, hooks, plugin, and instructions for those workflows.
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/open-gsd/gsd-core/gsd-code-reviewnpx skills add open-gsd/gsd-core --skill gsd-code-reviewgit clone --depth 1 https://github.com/open-gsd/gsd-coreWrote 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-core/gsd-code-review)<a href="https://agentmods.dev/skills/open-gsd/gsd-core/gsd-code-review"><img src="https://agentmods.dev/badge/skills/open-gsd/gsd-core/gsd-code-review.svg" alt="Measured on agentmods" 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 | $0.00022 | $0.00653 |
| Opus 5 | $0.00011 | $0.00327 |
| Sonnet 5 | $0.00004 | $0.00131 |
| Haiku 4.5 | $0.00002 | $0.00065 |
Grade A, and why
gsd-code-review 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 6d 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
Spawns the gsd-code-reviewer agent to analyze code at the specified depth level. Produces REVIEW.md artifact in the phase directory with severity-classified findings.
Arguments:
- Phase number (required) — which phase's changes to review (e.g., "2" or "02")
--depth=quick|standard|deep(optional) — review depth level, overrides workflow.code_review_depth config- quick: Pattern-matching only (~2 min)
- standard: Per-file analysis with language-specific checks (~5-15 min, default)
- deep: Cross-file analysis including import graphs and call chains (~15-30 min)
--files file1,file2,...(optional) — explicit comma-separated file list, skips SUMMARY/git scoping (highest precedence for scoping)--fix(optional) — after review completes (or if REVIEW.md already exists), auto-apply fixes found. Spawns gsd-code-fixer agent. Accepts sub-flags:--all— include Info findings in fix scope (default: Critical + Warning only)--auto— enable fix + re-review iteration loop, capped at 3 iterations
Output: {padded_phase}-REVIEW.md in phase directory + inline summary of findings
<execution_context> @~/.claude/gsd-core/workflows/code-review.md </execution_context>
Optional flags parsed from $ARGUMENTS:
--depth=VALUE— Depth override (quick|standard|deep). If provided, overrides workflow.code_review_depth config.--files=file1,file2,...— Explicit file list override. Has highest precedence for file scoping per D-08. When provided, workflow skips SUMMARY.md extraction and git diff fallback entirely.
Context files (CLAUDE.md, SUMMARY.md, phase state) are resolved inside the workflow via gsd-tools query init.phase-op and delegated to agent via <required_reading> blocks.
Execute end-to-end.
The workflow (not this command) enforces these gates:
- Phase validation (before config gate)
- Config gate check (workflow.code_review)
- File scoping (--files override > SUMMARY.md > git diff fallback)
- Empty scope check (skip if no files)
- Agent spawning (gsd-code-reviewer)
- Result presentation (inline summary + next steps)
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.
- 6d ago First seen · 60 lines · 22 tokens per session scan A 95360b217def
gsd-code-review is a skill published in the GitHub repository open-gsd/gsd-core (9,125 stars, last pushed today), licensed MIT. It adds 22 tokens to every session and 653 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 2026-08-30.
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