ProductFlow: Skill for Claude Code

.agents/skills/trellis-break-loop/SKILL.md

trellis-break-loop is a skill for Claude Code, Codex from yuqie6/ProductFlow. It costs 50 tokens per session (1,080 once invoked), scanned A, original, MIT.

A post-debugging analysis guide for understanding why a bug happened and how to prevent the same kind from returning. It records causes, failed fixes, prevention measures, and lessons in project specifications.

In plain words
What is it for?
Use it after resolving a bug to classify the root cause, examine incomplete or surface-level fixes, and add safeguards or documentation for future work.
Why use it?
Fixing the visible symptom may leave the underlying process or contract unchanged, allowing similar bugs to recur.

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-break-loop/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-break-loop

README.md
[![agentmods](https://agentmods.dev/badge/skills/yuqie6/productflow/trellis-break-loop.svg)](https://agentmods.dev/skills/yuqie6/productflow/trellis-break-loop)
Your own site
<a href="https://agentmods.dev/skills/yuqie6/productflow/trellis-break-loop"><img src="https://agentmods.dev/badge/skills/yuqie6/productflow/trellis-break-loop.svg" alt="Measured on agentmods" height="20"></a>
Per session 50 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,080 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 $0.00050 $0.01080
Opus 5 $0.00025 $0.00540
Sonnet 5 $0.00010 $0.00216
Haiku 4.5 $0.00005 $0.00108

Measured 8d ago against content hash 35afb53fef42, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

trellis-break-loop 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 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.

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-break-loop/SKILL.md · 131 lines

How it starts

The opening of the file, as written. The whole thing — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Break the Loop - Deep Bug Analysis

When debug is complete, use this for deep analysis to break the "fix bug -> forget -> repeat" cycle.


Analysis Framework

Analyze the bug you just fixed from these 5 dimensions:

1. Root Cause Category

Which category does this bug belong to?

Category Characteristics Example
A. Missing Spec No documentation on how to do it New feature without checklist
B. Cross-Layer Contract Interface between layers unclear API returns different format than expected
C. Change Propagation Failure Changed one place, missed others Changed function signature, missed call sites
D. Test Coverage Gap Unit test passes, integration fails Works alone, breaks when combined
E. Implicit Assumption Code relies on undocumented assumption Timestamp seconds vs milliseconds

2. Why Fixes Failed (if applicable)

If you tried multiple fixes before succeeding, analyze each failure:

  • Surface Fix: Fixed symptom, not root cause
  • Incomplete Scope: Found root cause, didn't cover all cases
  • Tool Limitation: grep missed it, type check wasn't strict
  • Mental Model: Kept looking in same layer, didn't think cross-layer

3. Prevention Mechanisms

What mechanisms would prevent this from happening again?

Type Description Example
Documentation Write it down so people know Update thinking guide
Architecture Make the error impossible structurally Type-safe wrappers
Compile-time Strict type checking, no escape hatches Signature change causes compile error
Runtime Monitoring, alerts, scans Detect orphan entities
Test Coverage E2E tests, integration tests Verify full flow
Code Review Checklist, PR template "Did you check X?"

4. Systematic Expansion

What broader problems does this bug reveal?

  • Similar Issues: Where else might this problem exist?
  • Design Flaw: Is there a fundamental architecture issue?
  • Process Flaw: Is there a development process improvement?
  • Knowledge Gap: Is the team missing some understanding?

Read the full file on GitHub · 131 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 · 131 lines · 50 tokens per session scan A 35afb53fef42

Subscribe to this mod's changes

trellis-break-loop is a skill published in the GitHub repository yuqie6/ProductFlow (302 stars, last pushed 2d ago), licensed MIT. It adds 50 tokens to every session and 1,080 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.

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