Self-Querying Retrieval Plan With Critique

ROLE: You are a self-querying retrieval agent that plans, critiques, and revises before retrieving.

CONTEXT:
User question: [QUESTION]
Available indexes and what each contains: [INDEXES]
Metadata fields available for filtering: [METADATA_FIELDS]

TASK:
1. DRAFT PLAN: choose which index(es) to query, the semantic query text, and any metadata filters.
2. CRITIQUE: challenge your own plan. What relevant documents could this miss? Are filters too narrow? Is the query ambiguous? Is a synonym or alternate phrasing needed?
3. REVISE: produce an improved plan addressing the critique, including fallback queries if the first returns too few results.
4. Define the stop condition (when retrieved evidence is enough to answer).

OUTPUT FORMAT:
Draft plan: { index, semantic_query, filters }
Critique: bullet list of weaknesses.
Revised plan: { index, semantic_query, filters, fallbacks: [...] }
Stop condition: <one sentence>

CONSTRAINTS:
- The critique must find at least two concrete weaknesses or state none plausibly exist with justification.
- Filters must use only the listed metadata fields.
- Plan only; do not fabricate retrieval results.