What is zenith CLAUDE.md?

Repository instructions for ZenithDB, a Rust columnar database engine—a database that stores each field together—for AI-agent traces.

Use them when building the workspace, running one crate's tests, or preparing Rust changes that must pass CI.

They identify the required Rust toolchain and the formatting, linting, testing, license, and security checks enforced by continuous integration.

How Polarityinc/zenith configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Polarityinc/zenith. 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/Polarityinc/zenith/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/Polarityinc/zenith

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/polarityinc/zenith/claude-md/github.svg)](https://agentmods.dev/instructions/polarityinc/zenith/claude-md)

Your own site

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

Per session 2,262 This file is loaded in full into every session.

When invoked 2,262 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	$0.02262	$0.02262
Opus 5.5	$0.00905	$0.00905
Sonnet 5.5	$0.00452	$0.00452
Haiku 4.5	$0.00226	$0.00226

Measured 2mo ago against content hash 8de76d3e3e9a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

zenith 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 · 154 lines

How it starts

The opening of the file, as written. The whole thing — 154 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 repo is

ZenithDB — a Rust columnar database engine purpose-built for AI agent traces. 18-crate workspace, one cargo build. Engine name zenithdb, CLI binary zen, all crates prefixed zen_.

Toolchain

Rust 1.87 stable, pinned via rust-toolchain.toml (rustup will pick it up automatically).
protoc 3.21+ is required to build (brew install protobuf / apt-get install protobuf-compiler). Several crates run prost-build / tonic-build in their build.rs.

Common commands

CI runs four gates and rejects on any of them. Match them locally before pushing:

cargo fmt --all --check
cargo clippy --workspace --all-targets -- -D warnings   # -D warnings is enforced
cargo test --workspace --all-features
cargo deny check                                        # licenses + advisories

cargo audit --deny warnings runs in CI as a fifth gate.

Running a single test

cargo test -p <crate> <test_name>                       # unit/integration test in a crate
cargo test -p zen_format encoder::tests::roundtrip      # by full path
cargo test -p integration auth::                        # the integration suite lives in tests/integration
cargo test -p integration -- --nocapture                # see println! / tracing output

The integration / perf / chaos suites are separate crates under tests/ (not cargo test default targets — they're listed in the workspace members). Always pass -p integration / -p perf / -p chaos to target them.

Run the server

# Default dev profile — SQLite catalog + local-FS object store under ./data/. Zero external services.
cargo run --release -p zen_cli -- serve --config examples/zenithdb.dev.toml

zen_cli ships two binaries: zen (the user-facing CLI with serve, bench, admin-backup, admin-restore, etc.) and zenithdb (server-only entrypoint). Both live in crates/zen_cli/src/.

Read the full file on GitHub · 154 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 · 154 lines · 2,262 tokens per session scan A 8de76d3e3e9a

Subscribe to this mod's changes

zenith CLAUDE.md is an instructions file published in the GitHub repository Polarityinc/zenith (139 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 2,262 tokens to every session, about $0.0090 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.

zenith CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
zenith CLAUDE.mdPolarityinc/zenith	Instructions file	139	3mo ago	Apache-2.0	A	2,262	Claude Code
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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

zenith: Instructions file for Claude Code