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+# Phase 2: Tier 1-2 Providers - Context
+
+**Gathered:** 2026-04-05
+**Status:** Ready for planning
+**Mode:** Auto-generated (infrastructure phase — discuss skipped)
+
+<domain>
+## Phase Boundary
+
+The 26 highest-value LLM provider YAML definitions exist with accurate regex patterns, keyword lists, confidence levels, and verify endpoints — covering OpenAI, Anthropic, Google AI, AWS Bedrock, Azure OpenAI and all major inference platforms.
+
+</domain>
+
+<decisions>
+## Implementation Decisions
+
+### Claude's Discretion
+All implementation choices are at Claude's discretion — pure infrastructure/data phase. Use ROADMAP phase goal, success criteria, and existing provider YAML schema (providers/openai.yaml, providers/anthropic.yaml, providers/huggingface.yaml) as templates.
+
+</decisions>
+
+<code_context>
+## Existing Code Insights
+
+### Reusable Assets
+- providers/openai.yaml, providers/anthropic.yaml, providers/huggingface.yaml — reference YAML definitions
+- pkg/providers/schema.go — Provider struct with Name, Keywords, Patterns, Tier, Category, VerifySpec
+- pkg/providers/loader.go — embed.FS YAML loader
+- pkg/providers/registry.go — Registry with AC automaton built from all keywords
+
+### Established Patterns
+- YAML format: name, display_name, category, tier, format_version, last_verified, keywords[], patterns[], verify
+- Patterns have regex, entropy_min, confidence fields
+- Keywords are lowercase terms used for Aho-Corasick pre-filtering
+
+### Integration Points
+- providers/ directory — embed.FS reads all *.yaml files at compile time
+- Registry.AC() rebuilds automatically with new provider keywords
+
+</code_context>
+
+<specifics>
+## Specific Ideas
+
+No specific requirements — infrastructure phase. Refer to ROADMAP phase description and success criteria.
+
+</specifics>
+
+<deferred>
+## Deferred Ideas
+
+None — discuss phase skipped.
+
+</deferred>