Borrowing it
Nothing to install: this file belongs to codeprakhar25/agentdiff. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/codeprakhar25/agentdiff/main/CLAUDE.mdgit clone --depth 1 https://github.com/codeprakhar25/agentdiffWrote 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.
[](https://agentmods.dev/instructions/codeprakhar25/agentdiff/claude-md)<a href="https://agentmods.dev/instructions/codeprakhar25/agentdiff/claude-md"><img src="https://agentmods.dev/badge/instructions/codeprakhar25/agentdiff/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.
<a href="https://agentmods.dev/instructions/codeprakhar25/agentdiff/claude-md"><img src="https://agentmods.dev/badge/instructions/codeprakhar25/agentdiff/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00391 | $0.00391 |
| Opus 5.5 | $0.00156 | $0.00156 |
| Sonnet 5.5 | $0.00078 | $0.00078 |
| Haiku 4.5 | $0.00039 | $0.00039 |
Grade A, and why
agentdiff 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 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.
What it actually says
agentdiff — Project Context for Claude
Project summary
agentdiff is a Rust + Python CLI that tracks which AI agent (claude-code, cursor, opencode, copilot, etc.) wrote which lines of code in a git repo. It hooks into agent tool callbacks, captures to session.jsonl, then on commit runs prepare-ledger.py → finalize-ledger.py to produce signed AgentTrace records in .git/agentdiff/traces/{branch}.jsonl.
Architecture
- Capture: per-agent Python scripts (
capture-claude.py, etc.) write raw events to.git/agentdiff/session.jsonl - Prepare (
scripts/prepare-ledger.py): runs pre-commit, reads session.jsonl, computes per-file attribution using line overlap, writespending_ledger.json - Finalize (
scripts/finalize-ledger.py): runs post-commit, converts pending payload to signedAgentTrace, appends totraces/{branch}.jsonl - Store (
src/store.rs): reads traces intoEntrystructs forlist/reportcommands - Binary install path:
~/.local/bin/agentdiff(NOT~/.cargo/bin/) — alwayscp target/release/agentdiff ~/.local/bin/agentdiffafter build
Attribution invariants
copilotis in_EXCLUDED_AGENTS— captured in session.jsonl for stats, never wins file attribution- Files with no session evidence →
agent = "human", must be explicit in attribution dict agent = "human"in payload is the semantic token;git_authorholds the display namecontributor.type = "human"ifffile_agent == "human"— never infer from tool name
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.
- 1mo ago First seen · 18 lines · 391 tokens per session scan A 1537078b24e3
agentdiff CLAUDE.md is an instructions file published in the GitHub repository codeprakhar25/agentdiff (47 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 391 tokens to every session, about $0.0016 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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