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-quicknpx skills add open-gsd/gsd-core --skill gsd-quickgit 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-quick)<a href="https://agentmods.dev/skills/open-gsd/gsd-core/gsd-quick"><img src="https://agentmods.dev/badge/skills/open-gsd/gsd-core/gsd-quick.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 | $0.00024 | $0.01697 |
| Opus 5 | $0.00012 | $0.00848 |
| Sonnet 5 | $0.00005 | $0.00339 |
| Haiku 4.5 | $0.00002 | $0.00170 |
Grade A, and why
gsd-quick 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 179 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Quick mode is the same system with a shorter path:
- Spawns gsd-planner (quick mode) + gsd-executor(s)
- Quick tasks live in
.planning/quick/separate from planned phases - Updates STATE.md "Quick Tasks Completed" table (NOT ROADMAP.md)
Default: Skips research, discussion, plan-checker, verifier. Use when you know exactly what to do.
--discuss flag: Lightweight discussion phase before planning. Surfaces assumptions, clarifies gray areas, captures decisions in CONTEXT.md. Use when the task has ambiguity worth resolving upfront.
--full flag: Enables the complete quality pipeline — discussion + research + plan-checking + verification. One flag for everything.
--validate flag: Enables plan-checking (max 2 iterations) and post-execution verification only. Use when you want quality guarantees without discussion or research.
--research flag: Spawns a focused research agent before planning. Investigates implementation approaches, library options, and pitfalls for the task. Use when you're unsure of the best approach.
Granular flags are composable: --discuss --research --validate gives the same result as --full.
Subcommands:
list— List all quick tasks with statusstatus <slug>— Show status of a specific quick taskresume <slug>— Resume a specific quick task by slug
<execution_context> @~/.claude/gsd-core/workflows/quick.md </execution_context>
Context files are resolved inside the workflow (init quick) and delegated via <required_reading> blocks.
Parse $ARGUMENTS for subcommands FIRST:
- If $ARGUMENTS starts with "list": SUBCMD=list
- If $ARGUMENTS starts with "status ": SUBCMD=status, SLUG=remainder (strip whitespace, sanitize)
- If $ARGUMENTS starts with "resume ": SUBCMD=resume, SLUG=remainder (strip whitespace, sanitize)
- Otherwise: SUBCMD=run, pass full $ARGUMENTS to the quick workflow as-is
Slug sanitization (for status and resume): Strip any characters not matching [a-z0-9-]. Reject slugs longer than 60 chars or containing .. or /. If invalid, output "Invalid session slug." and stop.
LIST subcommand
When SUBCMD=list:
ls -d .planning/quick/*/ 2>/dev/null
For each directory found:
- Check if PLAN.md exists
- Check if SUMMARY.md exists; if so, read
statusfrom its frontmatter via:gsd-tools query frontmatter.get .planning/quick/{dir}/SUMMARY.md status - Determine directory creation date:
stat -f "%SB" -t "%Y-%m-%d"(macOS) orstat -c "%w"(Linux); fall back to the date prefix in the directory name (format:YYYYMMDD-prefix) - Derive display status:
- SUMMARY.md exists, frontmatter status=complete →
complete ✓ - SUMMARY.md exists, frontmatter status=incomplete OR status missing →
incomplete - SUMMARY.md missing, dir created <7 days ago →
in-progress - SUMMARY.md missing, dir created ≥7 days ago →
abandoned? (>7 days, no summary)
- SUMMARY.md exists, frontmatter status=complete →
SECURITY: Directory names are read from the filesystem. Before displaying any slug, sanitize: strip non-printable characters, ANSI escape sequences, and path separators using: name.replace(/[^\x20-\x7E]/g, '').replace(/[/\\]/g, ''). Never pass raw directory names to shell commands via string interpolation.
Display format:
Quick Tasks
---
slug date status
backup-s3-policy 2026-04-10 in-progress
auth-token-refresh-fix 2026-04-09 complete ✓
update-node-deps 2026-04-08 abandoned? (>7 days, no summary)
---
3 tasks (1 complete, 2 incomplete/in-progress)
If no directories found: print No quick tasks found. and stop.
STOP after displaying the list. Do NOT proceed to further 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.
- 2d ago First seen · 179 lines · 24 tokens per session scan A ba87a20c0417
gsd-quick is a skill published in the GitHub repository open-gsd/gsd-core (9,125 stars, last pushed today), licensed MIT. It adds 24 tokens to every session and 1,697 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 2026-09-03.
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