What is setting-up-local-cluster?

A setup guide for downloading the official CockroachDB database program and starting a three-node cluster on a developer’s computer.

Use it when beginning a CockroachDB project, when no database cluster is reachable, or when preparing a new development machine.

It removes the manual work of choosing the right download, installing it, and starting a local database without Docker or another runtime.

setting-up-local-cluster — Skill by cockroachlabs/cockroachdb-skills

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add cockroachlabs/cockroachdb-skills --skill setting-up-local-cluster

Clone the repo

git clone --depth 1 https://github.com/cockroachlabs/cockroachdb-skills

Made for: Claude Code, Codex.

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/skills/cockroachlabs/cockroachdb-skills/setting-up-local-cluster/github.svg)](https://agentmods.dev/skills/cockroachlabs/cockroachdb-skills/setting-up-local-cluster)

Your own site

<a href="https://agentmods.dev/skills/cockroachlabs/cockroachdb-skills/setting-up-local-cluster"><img src="https://agentmods.dev/badge/skills/cockroachlabs/cockroachdb-skills/setting-up-local-cluster/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/skills/cockroachlabs/cockroachdb-skills/setting-up-local-cluster"><img src="https://agentmods.dev/badge/skills/cockroachlabs/cockroachdb-skills/setting-up-local-cluster.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,883 The whole file, excluding the scripts and references it only reads on demand.

Security scan C 2 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	$0.00049	$0.01883
Opus 5.5	$0.00020	$0.00753
Sonnet 5.5	$0.00010	$0.00377
Haiku 4.5	$0.00005	$0.00188

Measured 2mo ago against content hash f6edf9783757, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

setting-up-local-cluster scanned grade C with 2 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

rm -rf $HOME/.cockroachdb/data $HOME/.cockroachdb/logs

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- `curl` or `wget` available for downloading the binary

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

setting-up-local-cluster — 100% identical, 0 lines differ
setting-up-local-cluster — 100% identical, 0 lines differ

skills/cockroachdb-onboarding-and-migrations/setting-up-local-cluster/SKILL.md · 181 lines

How it starts

The opening of the file, as written. The whole thing — 181 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Setting Up a Local CockroachDB Cluster

Guides you through downloading, installing, and starting a local CockroachDB cluster for development. Uses the official binary -- no Docker or external runtime dependencies required.

When to Use This Skill

Developer asks to "set up CockroachDB" or "start a local database"
No CockroachDB cluster is reachable
Developer wants to build an app with CockroachDB from scratch
Setting up a new development environment

Prerequisites

macOS (Intel or Apple Silicon), Linux (Intel or ARM), or Windows (Intel)
curl or wget available for downloading the binary
~500 MB disk space per node
Ports 26257-26259 (SQL), 26357-26359 (RPC), and 8080-8082 (DB Console) available for a 3-node cluster

Step 1: Detect Platform and Download

Detect the OS and architecture, then download the appropriate binary.

Download URLs

Base URL: https://binaries.cockroachdb.com/

OS	Architecture	Filename Pattern
Linux	Intel (amd64)	`cockroach-v{VERSION}.linux-amd64.tgz`
Linux	ARM (arm64)	`cockroach-v{VERSION}.linux-arm64.tgz`
macOS	Intel (amd64)	`cockroach-v{VERSION}.darwin-10.9-amd64.tgz`
macOS	Apple Silicon (arm64)	`cockroach-v{VERSION}.darwin-11.0-arm64.tgz`
Windows	Intel (amd64)	`cockroach-v{VERSION}.windows-6.2-amd64.zip`

Replace {VERSION} with the desired release (e.g., 25.4.9). See CockroachDB Releases for the latest GA version.

Installation

# Example: macOS Apple Silicon, v25.4.9
curl -fsSL https://binaries.cockroachdb.com/cockroach-v25.4.9.darwin-11.0-arm64.tgz | tar xz
mkdir -p ~/.cockroachdb/bin
cp cockroach-v25.4.9.darwin-11.0-arm64/cockroach ~/.cockroachdb/bin/
export PATH="$HOME/.cockroachdb/bin:$PATH"

If cockroach is already on PATH, skip the download.

Step 2: Start the Cluster

A 3-node cluster is recommended for development because it exercises replication, range distribution, leaseholder balancing, and survival goals -- core CockroachDB capabilities that a single node cannot demonstrate.

Read the full file on GitHub · 181 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 · 181 lines · 49 tokens per session scan C f6edf9783757

Subscribe to this mod's changes

setting-up-local-cluster is a skill published in the GitHub repository cockroachlabs/cockroachdb-skills (23 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 49 tokens to every session and 1,883 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it C with 2 findings (recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Databases DevOps and cloud

setting-up-local-cluster next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
setting-up-local-clustercockroachlabs/cockroachdb-skills	Skill	23	3mo ago	Apache-2.0	C	49	Claude Code, Codex
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volcengine-rds-postgresqlbytedance/agentkit-samples	Skill	484	today	Apache-2.0	A	63	Claude Code, Codex

setting-up-local-cluster