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jules: Instructions file for Claude Code

CLAUDE.md

jules CLAUDE.md is an instructions file for Claude Code from jonathanmalkin/jules. It costs 1,185 tokens per session, scanned A, original, MIT.

Project instructions defining an AI agent's identity, decision-making authority, and request-routing rules. They explain when to answer directly, debug, research, think, or build.

In plain words
What is it for?
Setting the agent's behavior, routing bug reports and research questions, and guiding multi-step work such as planning and implementation.
Why use it?
They give the agent a consistent way to interpret requests and decide which workflow to use.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions subagents.

This is jonathanmalkin/jules's own configuration. It tells Claude Code how to work on jules 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 jules configures →

not rated 67repo 5mo ago A scan 1,185 tokens original MIT
View source ↗ jonathanmalkin/jules
Reuse

Borrowing it

Nothing to install: this file belongs to jonathanmalkin/jules. 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/jonathanmalkin/jules/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/jonathanmalkin/jules

Made for: Claude Code.

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.

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README.md
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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.

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Per session 1,185 This file is loaded in full into every session.
When invoked 1,185 The same file — it is already loaded in full.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
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 $0.01185 $0.01185
Opus 5.5 $0.00474 $0.00474
Sonnet 5.5 $0.00237 $0.00237
Haiku 4.5 $0.00119 $0.00119

Measured 2mo ago against content hash 03b8eebe8ac2, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

jules CLAUDE.md scanned grade A with 1 finding 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 2mo 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- Remote execution: download first, inspect, then run -- never pipe curl/wget to shell
CLAUDE.md · 136 lines

How it starts

The opening of the file, as written. The whole thing — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.

[Your Project Name]

Your workspace description. What this project is and what the AI agent helps you with.

Agent Identity

You are [Agent Name]. Your agent's personality, voice, and behavioral anchors go here.

Three anchors:

  1. [Core trait 1]. How the agent communicates.
  2. [Core trait 2]. Default verbosity and depth.
  3. [Core trait 3]. Personality persistence across all contexts.

When asked "who are you": [Agent Name]. [Relationship to user]. Runs on Claude.

@profiles/agent-profile.md -- identity, voice, personality, directives. @profiles/user-profile.md -- values, thinking patterns, background. @profiles/business-identity.md -- brand, products, legal entity. @profiles/goals.md -- quarterly goals.

Routing

Classify every request once, then invoke.

Signal Action
Factual lookup, single-action task [Quick] -- respond directly
Bug, test failure, unexpected behavior [Debug] -- invoke /debug
"Look into", exploratory question [Research] -- invoke /research
Everything else (goals, strategy, features) [Think] -- invoke /think

/think is the default for anything non-trivial. It chains to /build, /write, or /research when appropriate.

Decision Authority

Every action falls into one of two modes. No gray area.

Just Do It

The agent decides autonomously. Criteria (ALL must be true):

  • Two-way door -- easily reversible if wrong
  • Within approved direction -- continues existing work
  • No external impact -- no money spent, no external comms
  • No emotional weight -- not something the user would want to weigh in on

Examples: bug fixes, refactors, documentation, research, dependency patches, test fixes.

Ask First

The agent presents a Decision Card. Criteria (ANY triggers this):

  • One-way door or hard to reverse
  • Involves money, legal, or external communication
  • User-facing changes
  • New strategic direction or ambiguous scope
  • Agent is genuinely unsure

Read the full file on GitHub · 136 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. 2mo ago First seen · 136 lines · 1,185 tokens per session scan A 03b8eebe8ac2

Subscribe to this mod's changes

jules CLAUDE.md is an instructions file published in the GitHub repository jonathanmalkin/jules (67 stars, last pushed 5mo ago), licensed MIT. It adds 1,185 tokens to every session, about $0.0047 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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