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-connectiongit 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-connection)<a href="https://agentmods.dev/skills/altinity/altinity-skills/altinity-expert-clickhouse-connection"><img src="https://agentmods.dev/badge/skills/altinity/altinity-skills/altinity-expert-clickhouse-connection/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-connection"><img src="https://agentmods.dev/badge/skills/altinity/altinity-skills/altinity-expert-clickhouse-connection.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 | $0.00069 | $0.01089 |
| Opus 5.5 | $0.00028 | $0.00436 |
| Sonnet 5.5 | $0.00014 | $0.00218 |
| Haiku 4.5 | $0.00007 | $0.00109 |
Grade A, and why
altinity-expert-clickhouse-connection 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 — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Connection, cluster and time window
Run this before any other altinity-expert-clickhouse-* skill. It produces the facts every later skill reuses: connection mode, cluster name (or single node), ClickHouse version, Keeper presence, time window.
Step 1: choose the connection mode
Check your available tools in this order and stop at the first match:
- MCP mode: a tool whose name contains
clickhouseand one ofquery,execute,sql(for exampleclickhouse_execute_query,mcp__clickhouse__execute_query). Send exactly one SQL statement per call. If several ClickHouse MCP servers exist, ask the user which one to use. - Exec mode: a shell tool plus
clickhouse-client(orclickhouse client). Use only the connection flags the user provided (--host,--port,--user,--password,--secure); do not guess credentials from environment variables. Run one statement per invocation with--query "<statement>". Never use--queries-fileor--multiquery. - Neither: stop and ask the user how to reach ClickHouse. Do not install software and do not write helper scripts.
Step 2: verify connectivity and collect header facts
Run this one statement. It works on a standalone server (no macro, no Keeper) and on a cluster:
SELECT
hostName() AS hostname,
version() AS version,
(SELECT substitution FROM system.macros WHERE macro = 'cluster') AS cluster_macro,
(SELECT groupUniqArray(cluster) FROM system.clusters WHERE NOT is_local) AS candidate_clusters,
(SELECT count() FROM system.tables WHERE database = 'system' AND name = 'zookeeper_connection') AS has_keeper,
formatReadableTimeDelta(uptime()) AS uptime,
formatReadableSize((SELECT value FROM system.asynchronous_metrics WHERE metric = 'OSMemoryTotal')) AS os_memory_total
If it fails with an authentication or network error, stop and ask for the connection details. Do not retry with guessed credentials.
Step 3: decide the cluster mode
cluster_macrois not empty → cluster mode. Leave'{cluster}'in every query pack exactly as written; the server expands the macro.cluster_macrois empty andcandidate_clustersis not empty → ask the user which cluster to use, then replace'{cluster}'with that name in each statement before running it.- Both empty → single-node mode. Replace
clusterAllReplicas('{cluster}', system.<table>)withsystem.<table>in each statement before running it.
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 · +9 lines · +18 tokens per session 9c592e964f9c
- 1mo ago First seen · 61 lines · 51 tokens per session scan A bb9eb27b7a84
altinity-expert-clickhouse-connection is a skill published in the GitHub repository Altinity/altinity-skills (17 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 69 tokens to every session and 1,089 once invoked, about $0.0003 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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