pattern

pattern is a skill for Claude Code from lis186/SourceAtlas. It costs 10 tokens per session (2,425 once invoked), scanned A, original, MIT.

A guide to the design patterns and conventions already used in a codebase. A design pattern is a recurring way of organizing code to solve a common problem.

In plain words
What is it for?
Use it when adding code that should match an existing pattern, such as a service, repository, state-management, or other recurring structure, and when you need example files to follow.
Why use it?
It helps developers follow the project’s existing style instead of inventing a different approach. The guide is based on example files found in that specific codebase.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter. Also seen: model in frontmatter; reads .claude/ paths.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is **Constitution**: [ANALYSIS_CONSTITUTION.md](../../../ANALYSIS_CONSTITUTION.md) v1.0.

Part of the sourceatlas plugin — 14 skills shipped together

Good fit Use it when adding code that should match an existing pattern, such as a service, repository, state-management, or other recurring structure, and when you need example files to follow.

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/lis186/SourceAtlas
agentmods
npx agentmods add skills/lis186/sourceatlas/pattern

Made for: Claude Code.

Or install sourceatlas, the plugin that ships this one along with the rest of its 14 skills.

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 pattern

README.md
[![agentmods](https://agentmods.dev/badge/skills/lis186/sourceatlas/pattern/github.svg)](https://agentmods.dev/skills/lis186/sourceatlas/pattern)
Your own site
<a href="https://agentmods.dev/skills/lis186/sourceatlas/pattern"><img src="https://agentmods.dev/badge/skills/lis186/sourceatlas/pattern/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 pattern

Your own site · 80×15
<a href="https://agentmods.dev/skills/lis186/sourceatlas/pattern"><img src="https://agentmods.dev/badge/skills/lis186/sourceatlas/pattern.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 10 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,425 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 4
    Skill selects an external model or provider that may use a different account or billing plan than the operator expects. Undisclosed model switches can cause unexpected cost or quota consumption.
    Fix: Remove the model/provider override or disclose it prominently and require explicit operator approval before invoking an external coding CLI or billed model.
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 $0.00010 $0.02425
Opus 5.5 $0.00004 $0.00970
Sonnet 5.5 $0.00002 $0.00485
Haiku 4.5 $0.00001 $0.00243

Measured 1mo ago against content hash b0aee1b87a3f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pattern 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 1mo 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.

plugin/commands/pattern/SKILL.md · 364 lines

How it starts

The opening of the file, as written. The whole thing — 364 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SourceAtlas: Pattern Learning Mode

Constitution: ANALYSIS_CONSTITUTION.md v1.0

Context

Pattern requested: $ARGUMENTS Goal: Learn how THIS specific codebase implements the requested pattern Time Limit: 5-10 minutes maximum

Quick Start

  1. Check cache (skip if --force flag present)
  2. Detect pattern using find-patterns.sh script
  3. Apply output mode (--brief / --full / smart)
  4. Analyze top 2-3 files (high-entropy priority)
  5. Extract conventions and best practices
  6. Generate implementation guide
  7. Verify output using verification-guide.md
  8. Auto-save to .sourceatlas/patterns/

Your Task

You are analyzing how THIS codebase implements a specific pattern by:

  1. Finding 2-3 best example files
  2. Extracting design patterns and conventions
  3. Providing actionable implementation guidance

Output Modes

Parameter Behavior Use Case
--brief List files only Quick file browser
--full Analyze all files Deep learning
(default) Smart: ≤5 files→full; >5→selection UI Balanced

Core Workflow

Execute these steps in order. See workflow.md for complete details.

Step 0: Parse Output Mode (10 seconds)

Purpose: Determine how much analysis to perform.

Detect flags:

  • --brief → List files only, no analysis
  • --full → Analyze all found files
  • No flag → Smart mode (adapt based on file count)

→ See workflow.md#step-0

Step 1: Execute Pattern Detection (1-2 minutes)

Purpose: Find relevant files using optimized search.

Use find-patterns.sh script first:

# Locate script (global → local)
if [ -f ~/.claude/scripts/atlas/find-patterns.sh ]; then
    SCRIPT_PATH=~/.claude/scripts/atlas/find-patterns.sh
elif [ -f scripts/atlas/find-patterns.sh ]; then
    SCRIPT_PATH=scripts/atlas/find-patterns.sh
fi

bash "$SCRIPT_PATH" "$ARGUMENTS"

Read the full file on GitHub · 364 lines

Files

What ships with it

4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 1mo ago First seen · 364 lines · 0 tokens per session scan A b0aee1b87a3f

Subscribe to this mod's changes

pattern is a skill published in the GitHub repository lis186/SourceAtlas (48 stars, last pushed 2mo ago), licensed MIT. It adds 10 tokens to every session and 2,425 once invoked, about $0.0000 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.

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