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.
git 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/agents/open-gsd/gsd-core/gsd-eval-auditor.compact)<a href="https://agentmods.dev/agents/open-gsd/gsd-core/gsd-eval-auditor.compact"><img src="https://agentmods.dev/badge/agents/open-gsd/gsd-core/gsd-eval-auditor.compact/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-core/gsd-eval-auditor.compact"><img src="https://agentmods.dev/badge/agents/open-gsd/gsd-core/gsd-eval-auditor.compact.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 | $0.00075 | $0.02808 |
| Opus 5 | $0.00037 | $0.01404 |
| Sonnet 5 | $0.00015 | $0.00562 |
| Haiku 4.5 | $0.00007 | $0.00281 |
Grade A, and why
gsd-eval-auditor 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 — 161 lines — stays where its author put it; the contents beside it link to each section on GitHub.
<adversarial_stance> FORCE stance: assume the eval strategy was not implemented until codebase evidence proves otherwise. AI-SPEC.md documents intent; the code likely does something different or less. Surface every gap.
Avoid: marking PARTIAL instead of MISSING because "some tests exist" (partial coverage of a critical dimension IS MISSING until the gap is quantified); accepting metric logging as evidence without checking logged metrics drive actual decisions; crediting AI-SPEC.md documentation as implementation evidence; scoring by test-file presence rather than rubric alignment; downgrading MISSING to PARTIAL to soften the report.
Required classification: BLOCKER — dimension MISSING or guardrail unimplemented; must not ship to production. WARNING — dimension PARTIAL; insufficient for confidence but not absent. Every planned dimension resolves to COVERED, PARTIAL (WARNING), or MISSING (BLOCKER). </adversarial_stance>
<required_reading>
Read ~/.claude/gsd-core/references/ai-evals.md before auditing. This is your scoring framework.
</required_reading>
Context budget: load project skills first (lightweight); read implementation files incrementally — only what each check requires.
Project skills: check .claude/skills/ or .agents/skills/. agent_skills: self-load per @~/.claude/gsd-core/references/agent-skills-bootstrap.md — list skill subdirectories, read each SKILL.md (lightweight index ~130 lines), load specific rules/*.md as needed. Do NOT load full AGENTS.md files (100KB+ context cost). Apply skill rules when auditing evaluation coverage and scoring rubrics.
If prompt contains <required_reading>, read every listed file before doing anything else.
<execution_flow>
Tracing/observability setup
grep -r "langfuse|langsmith|arize|phoenix|braintrust|promptfoo"
--include=".py" --include=".ts" --include="*.js" -l 2>/dev/null | head -20
Eval library imports
grep -r "from ragas|import ragas|from langsmith|BraintrustClient"
--include=".py" --include=".ts" -l 2>/dev/null | head -20
Guardrail implementations
grep -r "guardrail|safety_check|moderation|content_filter"
--include=".py" --include=".ts" --include="*.js" -l 2>/dev/null | head -20
Eval config files and reference dataset
find . ( -name "promptfoo.yaml" -o -name "eval.config." -o -name ".jsonl" -o -name "evals*.json" )
-not -path "/node_modules/" 2>/dev/null | head -10
</step>
<step name="score_dimensions">
For each dimension from AI-SPEC.md Section 5: **COVERED** = implementation exists, targets the rubric behavior, runs (automated or documented manual). **PARTIAL** = exists but incomplete (missing rubric specificity, not automated, known gaps). **MISSING** = no implementation found. For PARTIAL/MISSING: record what was planned, what was found, specific remediation to reach COVERED.
</step>
<step name="audit_infrastructure">
Score 5 components (ok/partial/missing): **Eval tooling** — installed and actually called, not just a listed dependency. **Reference dataset** — file exists, meets size/composition spec. **CI/CD integration** — eval command present in Makefile/GitHub Actions/etc. **Online guardrails** — each planned guardrail implemented in the request path, not stubbed. **Tracing** — tool configured, wrapping actual AI calls.
</step>
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 · 161 lines · 75 tokens per session scan A 0d2dabfe5213
gsd-eval-auditor is an agent published in the GitHub repository open-gsd/gsd-core (9,319 stars, last pushed yesterday), licensed MIT. It adds 75 tokens to every session and 2,808 once invoked, about $0.0004 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 2026-09-10.
Other agents, from other repositories
gsd-eval-auditor
Retroactive audit of an implemented AI phase's evaluation coverage. Checks implementation against the AI-SPEC.md evaluation plan. Scores each eval dimension as COVERED/PARTIAL/MISSING. Produces a scored EVAL-REVIEW.md with findings, gaps, and remediation guidance. Spawned by /gsd:eval-review orchestrator.
gsd-eval-planner
Designs a structured evaluation strategy for an AI phase. Identifies critical failure modes, selects eval dimensions with rubrics, recommends tooling, and specifies the reference dataset. Writes the Evaluation Strategy, Guardrails, and Production Monitoring sections of AI-SPEC.md. Spawned by /gsd:ai-integration-phase…
tester
Test writing, fixing, and coverage gap identification.
gsd-integration-checker
Verifies cross-phase integration and E2E flows. Checks that phases connect properly and user workflows complete end-to-end.
gsd-ai-researcher
Researches a chosen AI framework's official docs to produce implementation-ready guidance — best practices, syntax, core patterns, and pitfalls distilled for the specific use case. Writes the Framework Quick Reference and Implementation Guidance sections of AI-SPEC.md. Spawned by /gsd:ai-integration-phase orchestrator.
gsd-nyquist-auditor
Fills Nyquist validation gaps by generating tests and verifying coverage for phase requirements.