query-writing

Included with Lifetime

$97 forever

Write efficient BigQuery queries for Mozilla telemetry. Use when user asks about: Firefox DAU/MAU, telemetry queries, BigQuery Mozilla, baseline_clients, events_stream, search metrics, user counts, or Firefox data analysis.

Writing & Docs

What this skill does


# Mozilla BigQuery Query Writing

For table selection and aggregation hierarchy, see [data-catalog.md](../../knowledge/data-catalog.md).
For query templates and best practices, see [query-writing.md](../../knowledge/query-writing.md).
For data platform architecture, see [architecture.md](../../knowledge/architecture.md).
For external sources (Metric Hub, Confluence, UDF discovery), see [external-sources.md](../../knowledge/external-sources.md).

## Guardrails

- Use "clients" or "profiles" not "users" — BigQuery tracks client_id, not actual users
- Do not suggest joining across products by client_id — each product has its own namespace
- Always check for aggregate tables before suggesting raw tables

## Workflow

1. Identify query type (user counts, specific metric, events, search)
2. For standard metrics (DAU, MAU, retention, etc.), look up the authoritative definition and SQL via Metric Hub MCP (`get_metric_sql`) if available. For broader context on metric calculation logic, check Confluence via Atlassian MCP. If neither is available, use the templates in this plugin's knowledge files.
3. Select optimal table using the aggregation hierarchy in knowledge/data-catalog.md
4. Add required filters per knowledge/query-writing.md
5. Write the query following templates in knowledge/query-writing.md
6. If BigQuery MCP tools are available (`mcp__bigquery__*`), offer to execute the query directly:
   - `mcp__bigquery__execute_sql` to run queries
   - `mcp__bigquery__get_table_info` to inspect schemas
   - `mcp__bigquery__list_dataset_ids` / `mcp__bigquery__list_table_ids` to explore data
   - Always include partition filters and sample_id in executed queries

Files: 1

Size: 2.6 KB

Complexity: 12/100

Category: Writing & Docs

Source: https://github.com/akkomar/mozdata-claude-plugin/tree/main/skills/query-writing

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