What is Xolotl-Code CLAUDE.md?

Repository instructions for Xolotl Code, a desktop and command-line platform for evaluating and comparing coding agents on real engineering tasks. Its Tauri desktop app and Rust command-line tool share an engine and configuration file.

Use them when developing the desktop app, command-line tool, shared Rust engine, provider and skill settings, or evaluation features.

They prevent confusion between the project's two Rust build trees and explain how the two user interfaces share settings and functionality.

How cesarfrancots/Xolotl-Code configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to cesarfrancots/Xolotl-Code. 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/cesarfrancots/Xolotl-Code/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/cesarfrancots/Xolotl-Code

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/cesarfrancots/xolotl-code/claude-md/github.svg)](https://agentmods.dev/instructions/cesarfrancots/xolotl-code/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/cesarfrancots/xolotl-code/claude-md"><img src="https://agentmods.dev/badge/instructions/cesarfrancots/xolotl-code/claude-md/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/cesarfrancots/xolotl-code/claude-md"><img src="https://agentmods.dev/badge/instructions/cesarfrancots/xolotl-code/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,337 This file is loaded in full into every session.

When invoked 1,337 The same file — it is already loaded in full.

Security scan A 0 findings. 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.

Model	Per session	Once invoked
Fable 5.1	$0.01337	$0.01337
Opus 5.5	$0.00535	$0.00535
Sonnet 5.5	$0.00267	$0.00267
Haiku 4.5	$0.00134	$0.00134

Measured 2mo ago against content hash db6abb07d53e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

Xolotl-Code CLAUDE.md 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 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.

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.

CLAUDE.md · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

What this is

Xolotl Code — a desktop coding-agent platform for evaluating, comparing, and racing LLMs on real engineering work. It ships as two surfaces that share one engine and one config file:

Tauri desktop app (tauri-app/) — the primary surface: chat pane, agent/team worktree orchestration, an eval lab (incl. Goal Eval), and settings for providers/skills/MCP.
xolotl CLI (rust/crates/rusty-claude-cli/) — the same engine without the UI: multi-provider routing, slash commands, sessions, planning, tools, memory.

Both read ~/.xolotl-code/config.json, so a key configured in either tool works in both. (Legacy ~/.claw-code/config.json is auto-migrated on first run.)

Two separate Rust trees

There are two independent Rust build trees — do not confuse them:

rust/ — a Cargo workspace (crates/*) that is the shared engine + CLI. Has its own CI (.github/workflows/rust.yml, Rust 1.95.0, Linux+Windows+macOS).
tauri-app/src-tauri/ — the desktop app's Rust backend (separate crate, not part of the rust/ workspace). Has its own CI (.github/workflows/tauri-app.yml).

The engine logic lives in rust/crates/runtime/ (conversation loop, prompts, memory, tools, agent supervisor, streaming events). The Tauri backend wraps/reimplements engine concerns for the desktop and exposes them over IPC.

Commands

Rust workspace (`rust/`)

cargo build --workspace
cargo test --workspace --exclude compat-harness        # exclude compat-harness (external checks)
cargo test -p runtime <test_name>                      # single test
cargo fmt --all -- --check
cargo clippy --workspace --all-features --exclude compat-harness -- -D warnings
cargo install --path crates/rusty-claude-cli --force   # install the `xolotl` CLI

Clippy runs with pedantic + -D warnings and unsafe_code = "forbid" (see workspace lints in rust/Cargo.toml) — new code must be clean under both.

Read the full file on GitHub · 71 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.

2mo ago First seen · 71 lines · 1,337 tokens per session scan A db6abb07d53e

Subscribe to this mod's changes

Xolotl-Code CLAUDE.md is an instructions file published in the GitHub repository cesarfrancots/Xolotl-Code (6 stars, last pushed 4mo ago), licensed MIT. It adds 1,337 tokens to every session, about $0.0053 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 2026-08-31.

ai ai-agents anthropic coding-agent eval kimi

Xolotl-Code CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
Xolotl-Code CLAUDE.mdcesarfrancots/Xolotl-Code	Instructions file	6	4mo ago	MIT	A	1,337	Claude Code
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vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

Xolotl-Code: Instructions file for Claude Code

Borrowing it

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

CLAUDE.md

What this is

Two separate Rust trees

Commands

Rust workspace (`rust/`)

What this file has done since we first saw it

Xolotl-Code CLAUDE.md compared with instructions from other repositories

Xolotl-Code: Instructions file for Claude Code

Borrowing it

Wrote this? Show the measurements

What it costs to keep this loaded

Grade A, and why

Nothing flagged

How it starts

CLAUDE.md

What this is

Two separate Rust trees

Commands

Rust workspace (rust/)

What this file has done since we first saw it

Xolotl-Code CLAUDE.md compared with instructions from other repositories

Rust workspace (`rust/`)