brief-spec

brief-spec is a skill for Claude Code, Codex from metraton/gaia. It costs 19 tokens per session (3,554 once invoked), scanned A, original, MIT.

A skill for creating a feature brief before planning begins. The brief is stored in Gaia's database, which is treated as the source of truth rather than a file on disk.

In plain words
What is it for?
Use it to create or update a brief, set its status, and record acceptance criteria through the Gaia command-line interface.
Why use it?
It keeps the requested feature, tasks, and acceptance criteria in one authoritative place before implementation planning starts.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: names the AskUserQuestion tool.

Part of the gaia plugin — 38 skills, 9 agents, 11 hooks shipped together

Good fit Use it to create or update a brief, set its status, and record acceptance criteria through the Gaia command-line interface.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/metraton/gaia/brief-spec
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 metraton/gaia --skill brief-spec
Clone the repo
git clone --depth 1 https://github.com/metraton/gaia

Made for: Claude Code, Codex.

Or install gaia, the plugin that ships this one along with the rest of its 38 skills, 9 agents, 11 hooks.

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 brief-spec

README.md
[![agentmods](https://agentmods.dev/badge/skills/metraton/gaia/brief-spec/github.svg)](https://agentmods.dev/skills/metraton/gaia/brief-spec)
Your own site
<a href="https://agentmods.dev/skills/metraton/gaia/brief-spec"><img src="https://agentmods.dev/badge/skills/metraton/gaia/brief-spec/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.

agentmods 80×15 button for brief-spec

Your own site · 80×15
<a href="https://agentmods.dev/skills/metraton/gaia/brief-spec"><img src="https://agentmods.dev/badge/skills/metraton/gaia/brief-spec.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 19 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,554 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. 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 $0.00019 $0.03554
Opus 5 $0.00010 $0.01777
Sonnet 5 $0.00004 $0.00711
Haiku 4.5 $0.00002 $0.00355

Measured 8d ago against content hash e3a6f2525854, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

brief-spec scanned grade A with 1 finding 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 8d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

query: "curl -s http://localhost:3000/metrics | grep http_p95"
skills/brief-spec/SKILL.md · 370 lines

How it starts

The opening of the file, as written. The whole thing — 370 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Brief Spec

Conversational brief creation. The orchestrator loads this inline to co-create a brief with the user before dispatching to gaia-planner. The brief you write here is the contract you will audit the plan against: you own the resulting plan -- its tasks and its acceptance criteria -- and the planner produces it for you to check, not to approve on your behalf.

DB is the source of truth (read this first)

Briefs live in the Gaia substrate database (~/.gaia/gaia.db). They are created and mutated through the gaia brief CLI -- never by writing files on disk. The DB row IS the brief: there is no brief.md, no <status>_<slug>/ directory, no frontmatter on disk. When in doubt, there is no file to write -- there is a CLI command to run.

Execution follows authority. The orchestrator co-creates the brief and may use its trusted Gaia CLI lane for bounded reads and user-confirmed new/headless edit/set-status/AC writes. gaia-operator remains the alternative for batching or operational separation. Destructive deletion is outside the direct lane. The orchestrator owns the questions, confirmation, and content whichever executor carries the command.

If you find code, docs, or skills that still describe a filesystem layout under .claude/project-context/briefs/, that is legacy: flag it in cross_layer_impacts -- do not edit it as a side effect of a brief task.

Cuando llegas aquí

El orquestador cargó esta skill porque la conversación entró en Cerrar: el usuario y él han acordado varias cosas y es momento de materializarlas. No estás aquí porque la petición superó un umbral de tamaño. Estás aquí porque hay acuerdos que capturar.

Tu trabajo:

  1. Resumir los acuerdos que ya emergieron en la conversación previa -- no re-descubrirlos desde cero.
  2. Preguntar sólo lo que falte para convertir los acuerdos en AC reproducibles (evidence types, surface type).
  3. Materializar el brief en la DB con gaia brief new --headless, y presentarlo al usuario para validar.

Read the full file on GitHub · 370 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. 8d ago First seen · 370 lines · 19 tokens per session scan A e3a6f2525854

Subscribe to this mod's changes

brief-spec is a skill published in the GitHub repository metraton/gaia (3 stars, last pushed today), licensed MIT. It adds 19 tokens to every session and 3,554 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Related

Other skills, from other repositories