gsd-complete-milestone

gsd-complete-milestone is a skill for Codex from SpillwaveSolutions/agent-brain. It costs 16 tokens per session (1,575 once invoked), scanned A, original, MIT.

A workflow for closing a completed project milestone, a group of planned tasks, and preparing the project for its next version.

In plain words
What is it for?
Use it after completing a milestone to archive it and set up the next version. It also translates prompts and worker tasks from another coding-agent format.
Why use it?
It gives a defined process for archiving finished work and moving remaining project planning into the next cycle.

Skill for Codex

Written for Codex: installed under .codex/. Also seen: names the AskUserQuestion tool; mentions Claude Code; mentions Codex.

Good fit Use it after completing a milestone to archive it and set up…

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Install with agentmods
npx agentmods add skills/spillwavesolutions/agent-brain/gsd-complete-milestone
Install

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.

Any agent
npx skills add SpillwaveSolutions/agent-brain --skill gsd-complete-milestone
Clone the repo
git clone --depth 1 https://github.com/SpillwaveSolutions/agent-brain

Made for: Codex.

Wrote 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.

agentmods badge for gsd-complete-milestone

README.md
[![agentmods](https://agentmods.dev/badge/skills/spillwavesolutions/agent-brain/gsd-complete-milestone.svg)](https://agentmods.dev/skills/spillwavesolutions/agent-brain/gsd-complete-milestone)
Your own site
<a href="https://agentmods.dev/skills/spillwavesolutions/agent-brain/gsd-complete-milestone"><img src="https://agentmods.dev/badge/skills/spillwavesolutions/agent-brain/gsd-complete-milestone.svg" alt="Measured on agentmods" height="20"></a>
Per session 16 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,575 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00016 $0.01575
Opus 5 $0.00008 $0.00788
Sonnet 5 $0.00003 $0.00315
Haiku 4.5 $0.00002 $0.00158

Measured 2d ago against content hash 589e8156bc60, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

gsd-complete-milestone 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.

.codex/skills/gsd-complete-milestone/SKILL.md · 173 lines

How it starts

The opening of the file, as written. The whole thing — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.

<codex_skill_adapter>

A. Skill Invocation

  • This skill is invoked by mentioning $gsd-complete-milestone.
  • Treat all user text after $gsd-complete-milestone as {{GSD_ARGS}}.
  • If no arguments are present, treat {{GSD_ARGS}} as empty.

B. AskUserQuestion → request_user_input Mapping

GSD workflows use AskUserQuestion (Claude Code syntax). Translate to Codex request_user_input:

Parameter mapping:

  • headerheader
  • questionquestion
  • Options formatted as "Label" — description{label: "Label", description: "description"}
  • Generate id from header: lowercase, replace spaces with underscores

Batched calls:

  • AskUserQuestion([q1, q2]) → single request_user_input with multiple entries in questions[]

Multi-select workaround:

  • Codex has no multiSelect. Use sequential single-selects, or present a numbered freeform list asking the user to enter comma-separated numbers.

Execute mode fallback:

  • When request_user_input is rejected (Execute mode), present a plain-text numbered list and pick a reasonable default.

C. Task() → spawn_agent Mapping

GSD workflows use Task(...) (Claude Code syntax). Translate to Codex collaboration tools:

Direct mapping:

  • Task(subagent_type="X", prompt="Y")spawn_agent(agent_type="X", message="Y")
  • Task(model="...") → omit (Codex uses per-role config, not inline model selection)
  • fork_context: false by default — GSD agents load their own context via <files_to_read> blocks

Parallel fan-out:

  • Spawn multiple agents → collect agent IDs → wait(ids) for all to complete

Result parsing:

  • Look for structured markers in agent output: CHECKPOINT, PLAN COMPLETE, SUMMARY, etc.
  • close_agent(id) after collecting results from each agent </codex_skill_adapter>

Purpose: Create historical record of shipped version, archive milestone artifacts (roadmap + requirements), and prepare for next milestone. Output: Milestone archived (roadmap + requirements), PROJECT.md evolved, git tagged.

Read the full file on GitHub · 173 lines

Changes

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.

  1. 2d ago First seen · 173 lines · 16 tokens per session scan A 589e8156bc60

Subscribe to this mod's changes

gsd-complete-milestone is a skill published in the GitHub repository SpillwaveSolutions/agent-brain (118 stars, last pushed 3d ago), licensed MIT. It adds 16 tokens to every session and 1,575 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 2026-09-05.

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