chDB is an in-process OLAP SQL engine powered by ClickHouse, allowing applications to query analytical data without running a separate database server. Python users and data practitioners use it to work with formats such as Parquet, CSV, JSON, Arrow, and ORC through SQL or a pandas-compatible API. Its catalogue add-ons provide agent instructions, rules, skills, and an agent for working with the project.
Borrowing it
Nothing to install: this file belongs to chdb-io/chdb. 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/chdb-io/chdb/main/AGENTS.mdgit clone --depth 1 https://github.com/chdb-io/chdbWrote 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/chdb-io/chdb/agents-md)<a href="https://agentmods.dev/instructions/chdb-io/chdb/agents-md"><img src="https://agentmods.dev/badge/instructions/chdb-io/chdb/agents-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/chdb-io/chdb/agents-md"><img src="https://agentmods.dev/badge/instructions/chdb-io/chdb/agents-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 | $0.00257 | $0.00257 |
| Opus 5.5 | $0.00103 | $0.00103 |
| Sonnet 5.5 | $0.00051 | $0.00051 |
| Haiku 4.5 | $0.00026 | $0.00026 |
Grade A, and why
chdb AGENTS.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
AGENTS.md — chDB
This repository contains chDB's pandas-compatible DataStore API. The embedded ClickHouse engine and native bindings live in chdb-io/chdb-core.
See CONTRIBUTING.md for setup, commands, and contributor
workflow.
Architecture
- Keep DataFrame- and Series-producing operations lazy until their results are naturally required.
- Do not call
_execute()directly or add eager conversions to work around planner problems. - Keep one expression and planning model; select pandas or chDB execution at execution time.
Tests
- Mirror DataStore operations in pandas and compare columns, values, and row order when the operation defines it.
- Regression tests should reproduce the user's full operation chain. Run the property-based chain tests for dispatcher, planner, or SQL-builder changes.
- Do not weaken assertions or use
reset_index()to hide incorrect behavior. - Run the smallest relevant tests first, then the relevant full suite. Report only checks that were actually run.
Repository skills
Shared coding-agent skills live under .agents/skills.
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 Changed · -167 lines · -1,517 tokens per session 99ee15e9a43e
- 2mo ago First seen · 199 lines · 1,774 tokens per session scan A 161524ddccb9
chdb AGENTS.md is an instructions file published in the GitHub repository chdb-io/chdb (2,921 stars, last pushed 16d ago), licensed Apache-2.0. It adds 257 tokens to every session, about $0.0010 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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