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.
npx skills add Altinity/altinity-skills --skill altinity-expert-clickhouse-mutationsgit clone --depth 1 https://github.com/Altinity/altinity-skillsWrote 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/skills/altinity/altinity-skills/altinity-expert-clickhouse-mutations)<a href="https://agentmods.dev/skills/altinity/altinity-skills/altinity-expert-clickhouse-mutations"><img src="https://agentmods.dev/badge/skills/altinity/altinity-skills/altinity-expert-clickhouse-mutations/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/skills/altinity/altinity-skills/altinity-expert-clickhouse-mutations"><img src="https://agentmods.dev/badge/skills/altinity/altinity-skills/altinity-expert-clickhouse-mutations.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00050 | $0.01422 |
| Opus 5.5 | $0.00020 | $0.00569 |
| Sonnet 5.5 | $0.00010 | $0.00284 |
| Haiku 4.5 | $0.00005 | $0.00142 |
Grade A, and why
altinity-expert-clickhouse-mutations 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.
How it starts
The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mutation tracking and analysis
Answers "why is this mutation stuck or slow" from system.mutations, system.merges, system.parts, system.replication_queue and system.part_log. Mutations rewrite whole parts in the background; they are not transactional row updates.
Run altinity-expert-clickhouse-connection first if the connection mode, cluster and time window are not yet established.
Query packs
checks.sql— 11 checks: current mutation status, per-table mutation summary, stuck mutation detection by age, recently completed mutations, mutation duration per table, failed mutations in the part log, mutations executing right now, parts still awaiting mutation, mutation versus merge competition for the background pool, mutation creation rate and a breakdown by mutation command type. 3 of them needsystem.part_log.reference.md— background (settings, sizing, anti-patterns); read only when you need to explain a recommendation.
How to run the query packs
- Read each pack file from this skill's directory (the skill loader prints the directory path).
- Run statements one at a time, never a whole file. Statements end with
;and start with a-- @check <id> <title>header; keep the id with its result. - Honor
-- @requires: skip the statement when the named table is missing, whenkeeperis required and the server has no Keeper/ZooKeeper, or when the version condition is not met. List skipped ids with the reason. - Keep
{cluster}as written when a cluster macro exists; otherwise apply the connection skill's rewrite rule. Any other{placeholder}is a template variable: substitute a real value first or skip the statement. - On an error, record the check id and the first line of the error, then continue. Only for
UNKNOWN_IDENTIFIER, runDESCRIBE TABLE system.<table>and drop the missing column. - A
severitycolumn is the verdict for that row. Copy it; do not re-grade.
Deep-dive statements
Once a stuck mutation is identified, these three statements say what is blocking it. Substitute {database} and {table} with the table from check mutations-03.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · -39 lines · +16 tokens per session daa6d05a09cc
- 1mo ago First seen · 123 lines · 34 tokens per session scan A 860b9006dba0
altinity-expert-clickhouse-mutations is a skill published in the GitHub repository Altinity/altinity-skills (17 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 50 tokens to every session and 1,422 once invoked, about $0.0002 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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