What is coz CLAUDE.md?

Project-specific instructions for Claude Code in the coz repository, a project about causal profiling, which investigates what causes program performance problems.

They guide work on the repository's instructions, project structure, reasons for causal profiling, and build system.

They give the assistant the context and build guidance needed to change the project correctly.

How plasma-umass/coz configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to plasma-umass/coz. 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/plasma-umass/coz/master/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/plasma-umass/coz

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/plasma-umass/coz/claude-md/github.svg)](https://agentmods.dev/instructions/plasma-umass/coz/claude-md)

Your own site

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

Per session 5,054 This file is loaded in full into every session.

When invoked 5,054 The same file — it is already loaded in full.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown 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	$0.05054	$0.05054
Opus 5.5	$0.02022	$0.02022
Sonnet 5.5	$0.01011	$0.01011
Haiku 4.5	$0.00505	$0.00505

Measured 2mo ago against content hash 3f1c38abc60b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

coz CLAUDE.md scanned grade B 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

sudo make install

CLAUDE.md · 464 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

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 · 464 lines · 5,054 tokens per session scan B 3f1c38abc60b

Subscribe to this mod's changes

coz CLAUDE.md is an instructions file published in the GitHub repository plasma-umass/coz (4,568 stars, last pushed 11d ago), with no licence file. It adds 5,054 tokens to every session, about $0.0202 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Optimization causal-inference performance-analysis performance-engineering profiler

coz CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
coz CLAUDE.mdplasma-umass/coz	Instructions file	4.6k	11d ago	none	B	5,054	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
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

coz: Instructions file for Claude Code