ProductFlow: Skill for Claude Code

.agents/skills/trellis-update-spec/SKILL.md

trellis-update-spec is a skill for Claude Code, Codex from yuqie6/ProductFlow. It costs 40 tokens per session (2,418 once invoked), scanned A, original, MIT.

A guide for recording executable code specifications: concrete commands, API or database contracts, validation behavior, and required tests.

In plain words
What is it for?
Documenting changes to commands, APIs, databases, infrastructure, environment settings, and cross-layer data contracts.
Why use it?
It preserves important implementation decisions so future sessions can follow and verify them.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is yuqie6/ProductFlow's own configuration. It tells Claude Code and Codex how to work on ProductFlow itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything ProductFlow configures →

Reuse

Borrowing it

Nothing to install: this file belongs to yuqie6/ProductFlow. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/yuqie6/ProductFlow/main/.agents/skills/trellis-update-spec/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/yuqie6/ProductFlow

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-update-spec

README.md
[![agentmods](https://agentmods.dev/badge/skills/yuqie6/productflow/trellis-update-spec/github.svg)](https://agentmods.dev/skills/yuqie6/productflow/trellis-update-spec)
Your own site
<a href="https://agentmods.dev/skills/yuqie6/productflow/trellis-update-spec"><img src="https://agentmods.dev/badge/skills/yuqie6/productflow/trellis-update-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 trellis-update-spec

Your own site · 80×15
<a href="https://agentmods.dev/skills/yuqie6/productflow/trellis-update-spec"><img src="https://agentmods.dev/badge/skills/yuqie6/productflow/trellis-update-spec.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 40 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,418 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 pass 7 Sept 2026
How audits are shown
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 $0.00040 $0.02418
Opus 5 $0.00020 $0.01209
Sonnet 5 $0.00008 $0.00484
Haiku 4.5 $0.00004 $0.00242

Measured 10d ago against content hash 003ce08a3404, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

trellis-update-spec 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 10d 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.

Origin

Copies of this mod

5 near-identical copies found in the catalogue:

.agents/skills/trellis-update-spec/SKILL.md · 357 lines

How it starts

The opening of the file, as written. The whole thing — 357 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Update Code-Spec - Capture Executable Contracts

When you learn something valuable (from debugging, implementing, or discussion), use this to update the relevant code-spec documents.

Timing: After completing a task, fixing a bug, or discovering a new pattern


Code-Spec First Rule (CRITICAL)

In this project, "spec" for implementation work means code-spec:

  • Executable contracts (not principle-only text)
  • Concrete signatures, payload fields, env keys, and boundary behavior
  • Testable validation/error behavior

If the change touches infra or cross-layer contracts, code-spec depth is mandatory.

Mandatory Triggers

Apply code-spec depth when the change includes any of:

  • New/changed command or API signature
  • Cross-layer request/response contract change
  • Database schema/migration change
  • Infra integration (storage, queue, cache, secrets, env wiring)

Mandatory Output (7 Sections)

For triggered tasks, include all sections below:

  1. Scope / Trigger
  2. Signatures (command/API/DB)
  3. Contracts (request/response/env)
  4. Validation & Error Matrix
  5. Good/Base/Bad Cases
  6. Tests Required (with assertion points)
  7. Wrong vs Correct (at least one pair)

When to Update Code-Specs

Trigger Example Target Spec
Implemented a feature Added a new integration or module Relevant spec file
Made a design decision Chose extensibility pattern over simplicity Relevant spec + "Design Decisions" section
Fixed a bug Found a subtle issue with error handling Relevant spec (e.g., error-handling docs)
Discovered a pattern Found a better way to structure code Relevant spec file
Hit a gotcha Learned that X must be done before Y Relevant spec + "Common Mistakes" section
Established a convention Team agreed on naming pattern Quality guidelines
New thinking trigger "Don't forget to check X before doing Y" guides/*.md (as a checklist item)

Read the full file on GitHub · 357 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. 10d ago First seen · 357 lines · 40 tokens per session scan A 003ce08a3404

Subscribe to this mod's changes

trellis-update-spec is a skill published in the GitHub repository yuqie6/ProductFlow (302 stars, last pushed today), licensed MIT. It adds 40 tokens to every session and 2,418 once invoked, about $0.0002 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.

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