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implementing-warehouse-sources

Implement and extend PostHog Data warehouse import sources. Use when adding a new source under products/warehouse_sources/backend/temporal/data_imports/sources, adding datasets/endpoints to an existing source, or adding incremental sync, resumable imports, webhook ingestion, pagination, credentials validation, and source tests.

68

Quality

83%

Does it follow best practices?

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SKILL.md
Quality
Evals
Security

Quality

Content

75%Weight 40%Scale 1-5

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A highly actionable, well-structured skill with concrete commands, code, and checklists for a genuinely complex task. The main weaknesses are redundancy across sections and a long monolithic body where some deep-dive sections could be moved to reference files.

Suggestions

Consolidate the 'unreleasedSource' guidance into one place (step 13) and reference it from the checklist and Common pitfalls instead of re-explaining it in each, to cut redundancy.

Extract the detailed 'Reading the fan-out parent from the warehouse' and 'Multi-schema SQL database sources' sections into reference files under references/, keeping only a summary plus a clearly signaled link in SKILL.md.

Add an explicit validate-then-fix-then-retry loop to the end-to-end workflow (e.g., 'if tests fail, fix and re-run ruff + targeted tests') to match the clarity of the top workflow anchor.

DimensionReasoningScore

Conciseness

The body is information-dense and largely avoids explaining concepts Claude already knows, but several topics are repeated across sections — 'unreleasedSource' is treated at length in step 13, the checklist, and Common pitfalls, and sort_mode/incremental warnings recur in three places — so it could be tightened.

3 / 5

Actionability

Provides exact commands ('pnpm run generate:source-configs', 'DEBUG=1 python manage.py makemigrations'), concrete file paths, copy-paste code blocks, specific enum members, and precise naming conventions — fully executable guidance covering the common cases.

5 / 5

Workflow Clarity

A clear 15-step end-to-end workflow with a matching implementation checklist and explicit validation steps (generators, schema:build, migrations, curl verification), though explicit error-recovery feedback loops ('if validation fails, fix and re-run') are less crisp than the top anchor.

4 / 5

Progressive Disclosure

Well-organized into clearly headed sections with one clearly-signaled, one-level-deep reference (references/oauth-app-deployment.md, verified present), but the single file is long and some very detailed inline sections (warehouse parent reuse, multi-schema SQL checklist) could be split into reference files.

4 / 5

Total

16

/

20

Passed

Description

92%Weight 40%Scale 1-5

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description is specific, complete, and clearly scoped to a distinct niche with an explicit 'Use when' trigger clause and a concrete repo path. Minor room to add user-facing synonyms/file extensions for trigger terms.

DimensionReasoningScore

Specificity

Lists multiple concrete actions — 'Implement and extend', 'adding a new source', 'adding datasets/endpoints', 'incremental sync, resumable imports, webhook ingestion, pagination, credentials validation, and source tests' — giving comprehensive coverage of the skill's capabilities.

5 / 5

Completeness

Explicitly answers both 'what' ('Implement and extend PostHog Data warehouse import sources') and 'when' with a concrete 'Use when...' clause enumerating the triggering situations.

5 / 5

Trigger Term Quality

Strong natural phrases a developer would say ('Data warehouse import sources', 'incremental sync', 'pagination', 'credentials validation', 'source tests'), though some are jargon-heavy ('resumable imports', 'webhook ingestion') and no file extensions or common synonyms are included.

4 / 5

Distinctiveness Conflict Risk

A clear, narrow niche (PostHog Data warehouse import sources) pinned to an exact repo path, making false-trigger conflict with other skills minimal.

5 / 5

Total

19

/

20

Passed

Validation

87%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation14 / 16 Passed

Validation for skill structure

CriteriaDescriptionResult

skill_md_line_count

SKILL.md is long (854 lines); consider splitting into references/ and linking

Warning

relative_links

Relative link issues: 1 missing, 2 suspicious

Warning

Total

14

/

16

Passed

Repository
PostHog/posthog
Reviewed

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