trellis-brainstorm

trellis-brainstorm is a skill for Claude Code, Codex from fy-agent/fyagent. It costs 65 tokens per session (2,139 once invoked), scanned A, original, no licence file.

A requirements-discovery workflow for new or complicated development work. It creates a task workspace, builds an initial product requirements document, asks focused questions, researches choices, and narrows the first version's scope.

In plain words
What is it for?
Use it to clarify a feature, compare technical options, agree on a minimum viable version, and prepare a plan for implementation.
Why use it?
It reduces uncertainty before coding when requirements are incomplete or several technical approaches could work.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing. Also seen: installed under .agents/ (shared by several agents).

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is TASK_DIR=$(python ./.trellis/scripts/task.py create "<short task title>" --description "<one-line summary>" --slug <slug>).

Good fit Use it to clarify a feature, compare technical options, agree on a minimum viable version, and prepare a plan for implementation.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/fy-agent/fyagent
agentmods
npx agentmods add skills/fy-agent/fyagent/trellis-brainstorm

Made for: Claude Code, 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 trellis-brainstorm

README.md
[![agentmods](https://agentmods.dev/badge/skills/fy-agent/fyagent/trellis-brainstorm.svg)](https://agentmods.dev/skills/fy-agent/fyagent/trellis-brainstorm)
Your own site
<a href="https://agentmods.dev/skills/fy-agent/fyagent/trellis-brainstorm"><img src="https://agentmods.dev/badge/skills/fy-agent/fyagent/trellis-brainstorm.svg" alt="Measured on agentmods" height="20"></a>
Per session 65 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,139 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. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
SkillSpector: 1 finding, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

  • medium Excessive Agency · line 22
    Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.
    Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
How audits are shown
Origin unknown 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 $0.00065 $0.02139
Opus 5 $0.00032 $0.01069
Sonnet 5 $0.00013 $0.00428
Haiku 4.5 $0.00006 $0.00214

Measured 4d ago against content hash dfed2c1038dc, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

trellis-brainstorm 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 4d 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.

.agents/skills/trellis-brainstorm/SKILL.md · 201 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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. 4d ago Changed dfed2c1038dc
  2. 8d ago First seen · 201 lines · 65 tokens per session scan A fb7399cda317

Subscribe to this mod's changes

trellis-brainstorm is a skill published in the GitHub repository fy-agent/fyagent (1,107 stars, last pushed today), with no licence file. It adds 65 tokens to every session and 2,139 once invoked, about $0.0003 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 2026-08-30.