Summary

Drafts a new AI-agent skill at skills/clickhouse-js-node-coding/, sourced from the examples/node/coding/*.ts corpus and scoped to day-to-day coding against @clickhouse/client (Node). Mirrors the structure of the existing clickhouse-js-node-troubleshooting skill so the two compose cleanly.

• SKILL.md — frontmatter (name + trigger description), Node-only banner, How-To-Use rules (right method per task, version-constraint callouts, JSONEachRow default, never template-literal user input), Task Index mapping intent → reference file, and an "Out of scope" section that delegates only to the existing clickhouse-js-node-troubleshooting skill and routes the other topics (performance, security, schema-and-deployments, web) to the corresponding examples/node/{performance,security,schema-and-deployments}/ and examples/web/ directories instead of pointing at sibling skill names that don't exist in this repo.
• reference/ (11 files) — one per Task Index row, each opening with a version-applies banner and citing the backing example(s):
  • client-configuration.md, ping.md, insert-formats.md, insert-columns.md, insert-values.md, async-insert.md, select-formats.md, query-parameters.md, sessions.md, data-types.md, custom-json.md.
• evals/evals.json — 8 starter evals using the same { id, prompt, expected_output, files, expectations } shape as the troubleshooting skill, covering one prompt per major reference file (config, ping, insert, columns, parameter binding, sessions, JSON column type, custom JSON parser).

In response to review feedback, the "Configuration via URL parameters" section in reference/client-configuration.md was tightened to spell out the fixed allowlist (plus the clickhouse_setting_ / ch_ / http_header_ prefixes) and to call out the Unknown URL parameters: ... throw, with a citation to packages/client-common/src/config.ts. The equivalent config-object example in the same file was corrected to import ClickHouseLogLevel from @clickhouse/client and use log: { level: ClickHouseLogLevel.TRACE } instead of the invalid top-level log_level: 'TRACE', with a note clarifying the URL-parameter-to-config-object mapping for log levels. Additionally, reference/select-formats.md was updated so ResultSet.close() is documented as synchronous (no await) in both the methods table row and the "stream half-consumed" common-pitfall note, matching the actual close(): void API. Following further review, every remaining reference to the non-existent clickhouse-js-node-performance sibling skill was replaced with a link to the in-repo examples/node/performance/ directory across SKILL.md, reference/async-insert.md, reference/insert-formats.md, and reference/select-formats.md (intro, methods table, and Parquet-related notes), so the skill no longer points at unavailable skill identifiers. The "Session-level SET commands" snippet in reference/sessions.md was also made self-contained by adding the createClient and node:crypto imports, setting max_open_connections: 1 alongside session_id (consistent with the per-client concurrency guidance earlier in the same doc), and ending with await client.close().

No runtime code or build config is touched. The client-node prepack script already copies the repo-root skills/ directory into the published package, so the new skill ships to npm without further changes.

Checklist

• A human-readable description of the changes was provided to include in CHANGELOG