Agent skill

Replication Guide

ReplicatedMergeTree operations, failover procedures, lag diagnosis, quorum writes, and Keeper management.

GPL-3.0Auto-check passedDatabases

Install Replication Guide

skills CLI

$ npx skills add chmonitor/chmonitor --skill replication-guide -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install chmonitor/chmonitor replication-guide --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/chmonitor/chmonitor.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/replication-guide .claude/skills/replication-guide && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "replication-guide" agent skill from https://github.com/chmonitor/chmonitor/tree/main/.agents/skills/replication-guide into .claude/skills/replication-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replication-guide", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/chmonitor/chmonitor/tree/main/.agents/skills/replication-guide

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add chmonitor/chmonitor --skill replication-guide -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install chmonitor/chmonitor replication-guide --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/chmonitor/chmonitor.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/replication-guide .agents/skills/replication-guide && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "replication-guide" agent skill from https://github.com/chmonitor/chmonitor/tree/main/.agents/skills/replication-guide into .agents/skills/replication-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replication-guide", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add chmonitor/chmonitor --skill replication-guide -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install chmonitor/chmonitor replication-guide --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/chmonitor/chmonitor.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/replication-guide .cursor/skills/replication-guide && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "replication-guide" agent skill from https://github.com/chmonitor/chmonitor/tree/main/.agents/skills/replication-guide into .cursor/skills/replication-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replication-guide", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/chmonitor/chmonitor.git --path .agents/skills/replication-guide

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add chmonitor/chmonitor --skill replication-guide -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install chmonitor/chmonitor replication-guide --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/chmonitor/chmonitor.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/replication-guide .gemini/skills/replication-guide && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "replication-guide" agent skill from https://github.com/chmonitor/chmonitor/tree/main/.agents/skills/replication-guide into .gemini/skills/replication-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replication-guide", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install chmonitor/chmonitor replication-guide

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add chmonitor/chmonitor --skill replication-guide -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/chmonitor/chmonitor.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/replication-guide .github/skills/replication-guide && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "replication-guide" agent skill from https://github.com/chmonitor/chmonitor/tree/main/.agents/skills/replication-guide into .github/skills/replication-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replication-guide", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add chmonitor/chmonitor --skill replication-guide -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install chmonitor/chmonitor replication-guide --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/chmonitor/chmonitor.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/replication-guide .opencode/skills/replication-guide && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "replication-guide" agent skill from https://github.com/chmonitor/chmonitor/tree/main/.agents/skills/replication-guide into .opencode/skills/replication-guide/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "replication-guide", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: replication-guide
GitHub stars: 299
Token cost: ~555 tokens
SKILL.md length: 230 words
Files: 1
Skills in repo: 53
Repo updated: Oct 5, 2026
First seen: Oct 7, 2026
Licence: GPL-3.0

At a glance

ReplicatedMergeTree operations, failover procedures, lag diagnosis, quorum writes, and Keeper management.

Works in 5 steps: Check replica status: SELECT * FROM… → Verify Keeper connectivity: SELECT *… → If replica is readonly due to Keeper… → …
Tasks that involve Backup and disaster recovery
SKILL.md covers ReplicatedMergeTree Basics, Monitoring Replication, Failover Procedures and Quorum Writes, plus 2 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Replication Guide is an agent skill from chmonitor/chmonitor. ReplicatedMergeTree operations, failover procedures, lag diagnosis, quorum writes, and Keeper management.

Its SKILL.md is about 560 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Databases, covering Backup and disaster recovery and Database administration. It works with ClickHouse. The repository describes itself as: Open-source operational advisor for ClickHouse — real-time monitoring plus AI-driven index/partition/materialized-view recommendations. The licence is GPL-3.0.

When your agent uses it

Tasks that involve Backup and disaster recovery
Tasks that involve Database administration

Example prompts

“/replication-guide”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

Check replica status: SELECT * FROM system.replicas WHERE is_readonly = 1
Verify Keeper connectivity: SELECT * FROM system.zookeeper WHERE path = '/'
If replica is readonly due to Keeper disconnect, it auto-recovers when connection restores
For permanent failures: SYSTEM DROP REPLICA 'replica_name' FROM TABLE db.table
Corrupted metadata: SYSTEM RESTORE REPLICA db.table

What it can do on your machine

Read from SKILL.md and the folder at commit fc39ef0. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Replication Guide loads about 555 tokens when it runs. Until then it costs about 31 tokens; SKILL.md has 230 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~31
When it runs · the whole SKILL.md, loaded when a task matches: ~555

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from chmonitor/chmonitor at commit fc39ef0, republished under its GPL-3.0 licence (© chmonitor). 230 words, ~555 tokens.

Download SKILL.mdSave it as .claude/skills/replication-guide/SKILL.md (or your agent's skills folder).

name: replication-guide
description: ReplicatedMergeTree operations, failover procedures, lag diagnosis, quorum writes, and Keeper management.

Replication Guide

ReplicatedMergeTree Basics

Engine: ReplicatedMergeTree('/clickhouse/tables/{shard}/{database}/{table}', '{replica}')
Requires ZooKeeper or ClickHouse Keeper
All replicas are equal — any replica can accept writes
Replication is asynchronous by default

Monitoring Replication

system.replicas — per-table status: absolute_delay, queue_size, is_leader, is_readonly
system.replication_queue — pending operations: fetches, merges, mutations
Key health indicators:
- absolute_delay = 0 — fully caught up
- is_readonly = 0 — accepting writes
- queue_size < 10 — healthy queue
- active_replicas = total_replicas — all replicas online

Failover Procedures

Check replica status: SELECT * FROM system.replicas WHERE is_readonly = 1
Verify Keeper connectivity: SELECT * FROM system.zookeeper WHERE path = '/'
If replica is readonly due to Keeper disconnect, it auto-recovers when connection restores
For permanent failures: SYSTEM DROP REPLICA 'replica_name' FROM TABLE db.table
Corrupted metadata: SYSTEM RESTORE REPLICA db.table

Quorum Writes

SET insert_quorum = 2 — wait for N replicas to confirm
SET insert_quorum_parallel = 1 — parallel quorum inserts (v21.8+)
SET insert_quorum_timeout = 60000 — timeout in ms
Use for critical data that must survive node failures

Keeper Management

ClickHouse Keeper is the recommended replacement for ZooKeeper
Monitor: system.zookeeper table for browsing ZK tree
Key paths: /clickhouse/tables/ for table metadata
Check Keeper health: SELECT * FROM system.asynchronous_metrics WHERE metric LIKE '%Keeper%'

Common Issues

Split brain: Multiple leaders — usually Keeper issue, restart Keeper
Readonly replica: Lost Keeper session — check network, Keeper logs
Queue buildup: Slow fetches — check network bandwidth, disk I/O
Diverged replicas: SYSTEM SYNC REPLICA db.table to force sync
Load the troubleshooting skill for OOM-related replica failures and disk-full scenarios.

Files

Just SKILL.md in .agents/skills/replication-guide of chmonitor/chmonitor.

Open the folder on GitHubat commit fc39ef0

Compare with similar skills

Replication Guide next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Replication Guide compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Replication Guide this skillchmonitor/chmonitor	299	—	~555	Automated safety check: Pass	GPL-3.0	2 days ago
DB AdminEliasOulkadi/shokunin	114	—	~2k	Automated safety check: Notes	MIT	3 days ago
Mongodbsickn33/agentic-awesome-skills	47k	2 repos	~2.7k	Automated safety check: Notes	MIT	today
Database Backupssickn33/agentic-awesome-skills	47k	2 repos	~3.1k	Automated safety check: Notes	MIT	today
Alloydb Basicsgoogle/skills	21k	—	~1.7k	Automated safety check: Pass	Apache-2.0	today
Alloydb Basicsdavila7/claude-code-templates	32k	—	~611	Automated safety check: Pass	MIT	today

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Works with

ClickHouse

Questions about Replication Guide

What does Replication Guide do?

ReplicatedMergeTree operations, failover procedures, lag diagnosis, quorum writes, and Keeper management. Replication Guide is an agent skill from chmonitor/chmonitor. ReplicatedMergeTree operations, failover procedures, lag diagnosis, quorum writes, and Keeper management.

When should I use Replication Guide?

Replication Guide fits situations like: tasks that involve Backup and disaster recovery; tasks that involve Database administration.

How do I install Replication Guide in Claude Code?

Run `npx skills add chmonitor/chmonitor --skill replication-guide -a claude-code`. Or copy the skill folder (.agents/skills/replication-guide in chmonitor/chmonitor) into .claude/skills/replication-guide in your project. Claude Code loads it when a task matches its description.

How do I install Replication Guide in Codex?

Run `npx skills add chmonitor/chmonitor --skill replication-guide -a codex`. Or copy the skill folder (.agents/skills/replication-guide in chmonitor/chmonitor) into .agents/skills/replication-guide in your project. Codex loads it when a task matches its description.

Can I use Replication Guide in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add chmonitor/chmonitor --skill replication-guide -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/replication-guide, .gemini/skills/replication-guide, .github/skills/replication-guide and .opencode/skills/replication-guide in your project.

What does Replication Guide need to run?

SKILL.md names no scripts, command-line tools or credentials: Replication Guide is instructions for the agent only.

Does Replication Guide access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Replication Guide safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Replication Guide use?

Replication Guide is published under the GPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Replication Guide use?

About 555 tokens (SKILL.md is roughly 2.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Replication Guide?

Skills that share tags, products or a category with Replication Guide: DB Admin (EliasOulkadi/shokunin, 114 stars), Mongodb (sickn33/agentic-awesome-skills, 47k stars), Database Backups (sickn33/agentic-awesome-skills, 47k stars) and Alloydb Basics (google/skills, 21k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Replication Guide?

chmonitor (a GitHub organization) maintains it in chmonitor/chmonitor, which has 299 GitHub stars. The repository holds 53 skills in this directory. The repository was last updated on October 5, 2026.

Source: chmonitor/chmonitor on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Replication Guide

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Replication Guide

ReplicatedMergeTree Basics

Monitoring Replication

Failover Procedures

Quorum Writes

Keeper Management

Common Issues

Files

Compare with similar skills

Similar skills

More from chmonitor/chmonitor

Related

Questions about Replication Guide