Open Feed Recsys Lab

Use this skill to review public feed recommendation repositories and separate what the source supports from what remains unproven.

Default target: https://github.com/xai-org/x-algorithm.

Review Workflow

1. Confirm the target repository, commit, public link, or user-provided file set.
2. Build an evidence ledger with repository/ref, files inspected, supported claims, weak claims, and open questions.
3. Separate source inspection from runnable-model proof. If Phoenix artifacts are missing, say execution is not verified.
4. Map the visible architecture: Home Mixer, Phoenix retrieval/ranking, Thunder, Grox, ads blending, and candidate pipelines when present.
5. Treat public algorithm claims as hypotheses. Mark each claim supported, partly_supported, unsupported, or not_public_repo.
6. Frame shareable output around reproducibility and evidence. Do not present the public source as a reach predictor or full live-platform clone.

Phoenix Artifact Readiness

Only treat Phoenix execution as verified after the official artifacts are present and the user has supplied a local run result. The expected extracted directory is:

phoenix/artifacts/oss-phoenix-artifacts/

Expected files include:

• retrieval/model_params.npz
• retrieval/embedding_tables.npz
• retrieval/config.json
• ranker/model_params.npz
• ranker/embedding_tables.npz
• ranker/config.json
• sports_corpus.npz
• example_sequence.json

If the report says Phoenix is not run-ready, state that source inspection succeeded but execution is blocked by missing extracted LFS artifacts.

Boundaries

• Use public source or user-provided local files only.
• Do not request or inspect private user data, authenticated account pages, or non-public analytics.
• Do not promise reach, ranking, virality, revenue, or live-platform equivalence.
• Do not claim that public source contains every production weight, threshold, model version, or serving rule.
• Do not execute repository code or delete local files as part of a review unless the user separately asks for that engineering work.

Output Shape

Return a concise review with:

• Target: repo, ref, and source date when known.
• Supported: claims backed by public source.
• Blocked: missing artifacts, missing configs, or live-platform gaps.
• Architecture: short component map.
• Risks: overclaims, ambiguous evidence, or unsafe product positioning.
• Next check: the smallest concrete verification step.

The preferred public-safe framing is:

I verified the open X For You algorithm locally at commit <sha>; here is the report.

Companion Skills

Use x-algo-claim-auditor when the user asks whether a public claim, screenshot text, or viral thread is supported by the source.

Use tinytroupe-feed-research-lab when the user asks to compare draft posts, simulate audience reactions, or pretest a post before publishing. Keep that work labeled as synthetic audience research, not source verification or reach prediction.