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 skills add open-gsd/gsd-core --skill gsd-phasegit 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-phase)<a href="https://agentmods.dev/skills/open-gsd/gsd-core/gsd-phase"><img src="https://agentmods.dev/badge/skills/open-gsd/gsd-core/gsd-phase.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 | $0.00027 | $0.00539 |
| Opus 5 | $0.00014 | $0.00269 |
| Sonnet 5 | $0.00005 | $0.00108 |
| Haiku 4.5 | $0.00003 | $0.00054 |
Grade A, and why
gsd-phase 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.
What it actually says
Mode routing:
- default (no flag): Add a new integer phase to the end of the current milestone → add-phase workflow
- --insert: Insert urgent work as a decimal phase (e.g., 72.1) between existing phases → insert-phase workflow
- --remove: Remove a future phase and renumber subsequent phases → remove-phase workflow
- --edit: Edit any field of an existing phase in place → edit-phase workflow
| Flag | Action | Workflow |
|---|---|---|
| (none) | Add new integer phase at end of milestone | add-phase |
| --insert | Insert decimal phase (e.g., 72.1) after specified phase | insert-phase |
| --remove | Remove future phase, renumber subsequent | remove-phase |
| --edit | Edit fields of existing phase in place | edit-phase |
<execution_context>
@/.claude/gsd-core/workflows/add-phase.md
@/.claude/gsd-core/workflows/insert-phase.md
@/.claude/gsd-core/workflows/remove-phase.md
@/.claude/gsd-core/workflows/edit-phase.md
</execution_context>
Parse the first token of $ARGUMENTS:
- If it is
--insert: strip the flag, pass remainder (format: ) to insert-phase workflow - If it is
--remove: strip the flag, pass remainder (phase number) to remove-phase workflow - If it is
--edit: strip the flag, pass remainder (phase-number [--force]) to edit-phase workflow - Otherwise: pass all of $ARGUMENTS (phase description) to add-phase workflow
Roadmap and state are resolved in-workflow via init phase-op and targeted reads.
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 Changed · +6 tokens per session 17ebef324bf2
- 3d ago First seen · 58 lines · 21 tokens per session scan A b377b03d13db
gsd-phase is a skill published in the GitHub repository open-gsd/gsd-core (9,140 stars, last pushed today), licensed MIT. It adds 27 tokens to every session and 539 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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write-milestone-brief
Synthesize the current conversation into a milestone brief (PRD). Writes to M###-CONTEXT.md by default, or files a GitHub issue only with explicit user confirmation. Use when asked to "turn this into a PRD", "draft a milestone brief", "capture this context", "write it up", or when enough has been discussed to commit…
spike-wrap-up
Package findings from a completed spike into a durable project-local skill that auto-loads on future similar work. Reads the latest .gsd/workflows/spikes/ dir, interviews the user on what's reusable, then writes .agents/skills/ /SKILL.md. Use when asked to "wrap up the spike", "package this as a skill", "make this…
director:status
See your project progress at a glance.
gsd-new-milestone
Start a new milestone cycle update PROJECT.md and route to requirements.
gsd-execute-phase
Execute all plans in a phase with wave-based parallelization.