r3bl-open-core: Skill for Claude Code

.agents/skills/fix-issue/SKILL.md

fix-issue is a skill for Claude Code, Codex from r3bl-org/r3bl-open-core. It costs 21 tokens per session (1,043 once invoked), scanned A, original, Apache-2.0.

A design-first workflow for investigating and fixing complex software issues. It separates research, design documentation, user review, and implementation.

In plain words
What is it for?
Use it for non-trivial bugs, features, and architectural changes that span multiple parts of a project.
Why use it?
It helps clarify the problem and compare solutions before code changes are made.

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 r3bl-org/r3bl-open-core's own configuration. It tells Claude Code and Codex how to work on r3bl-open-core 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 r3bl-open-core configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is git worktree add --relative ../roc-<name> <branch_name>.

Reuse

Borrowing it

Nothing to install: this file belongs to r3bl-org/r3bl-open-core. 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/r3bl-org/r3bl-open-core/main/.agents/skills/fix-issue/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/r3bl-org/r3bl-open-core

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 fix-issue

README.md
[![agentmods](https://agentmods.dev/badge/skills/r3bl-org/r3bl-open-core/fix-issue/github.svg)](https://agentmods.dev/skills/r3bl-org/r3bl-open-core/fix-issue)
Your own site
<a href="https://agentmods.dev/skills/r3bl-org/r3bl-open-core/fix-issue"><img src="https://agentmods.dev/badge/skills/r3bl-org/r3bl-open-core/fix-issue/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 fix-issue

Your own site · 80×15
<a href="https://agentmods.dev/skills/r3bl-org/r3bl-open-core/fix-issue"><img src="https://agentmods.dev/badge/skills/r3bl-org/r3bl-open-core/fix-issue.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 21 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,043 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 high

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 →

  • high Memory Poisoning · line 51
    Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.
    Fix: Protect agent memory and state from modification by untrusted content. Use read-only memory for critical instructions and validate all state changes.
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 $0.00021 $0.01043
Opus 5.5 $0.00008 $0.00417
Sonnet 5.5 $0.00004 $0.00209
Haiku 4.5 $0.00002 $0.00104

Measured 11d ago against content hash 88bbe86eabe2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fix-issue 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 11d 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/fix-issue/SKILL.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Issue Fix Workflow: Deep Exploration and Design

This skill codifies the "slow and steady" approach to solving non-trivial issues or adding features. It enforces exploring the problem space, considering alternative designs, and formalizing the design before writing any implementation code.

When to Use

Use this skill whenever you are:

  • Creating a new task file for a non-trivial issue or feature.
  • Asked by the user to "explore first", "design first", or "write a design doc".
  • Working on complex or architectural changes that span multiple components.

The Design-First Workflow

The workflow consists of four distinct steps:

┌───────────────────┐      ┌───────────────────┐      ┌───────────────────┐      ┌───────────────────┐
│ 1. Deep Research  │ ───► │  2. Design Doc    │ ───► │  3. User Review   │ ───► │ 4. Implementation │
│ (No Code Written) │      │  (Task MD File)   │      │   & Approval      │      │ (Iterative Step)  │
└───────────────────┘      └───────────────────┘      └───────────────────┘      └───────────────────┘

Step 1: Deep Research (No Code Written)

Before proposing any changes or writing a task file, gather context on the problem space:

  1. Read the issue description (e.g., via gh issue view <id>).
  2. Search the codebase to locate all relevant files, traits, types, and usages.
  3. Understand the control flow, thread boundaries, and lifecycle constraints.
  4. Do NOT write or modify any source code or run cargo check during this step.

Step 2: Design Doc (Task File Creation)

Create the task file under task/issue-<id>-fix.md or task/<name>.md. Create a new git branch for this task, push it, and open a Draft PR using gh pr create --draft --fill to track the work.

[!TIP] If creating a linked git worktree for the task, always use relative paths (or set git config --global worktree.useRelativePaths true) so the worktree remains portable across remote fleet machines (Linux and macOS):

git worktree add --relative ../roc-<name> <branch_name>

Read the full file on GitHub · 110 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. 11d ago Changed · -1 lines 88bbe86eabe2
  2. 15d ago Changed · +6 lines ecd6ba34e0be
  3. 2mo ago First seen · 105 lines · 21 tokens per session scan A dbf0b00deea8

Subscribe to this mod's changes

fix-issue is a skill published in the GitHub repository r3bl-org/r3bl-open-core (486 stars, last pushed yesterday), licensed Apache-2.0. It adds 21 tokens to every session and 1,043 once invoked, about $0.0001 per session on Opus 5.5. 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.