Deep Researcher

Use this skill when a task needs defensible, current, multi-source research: library/API decisions, dependency investigations, release or changelog analysis, GitHub issue/source archaeology, agent-prompt research, standards checks, or high-stakes citations.

Operating Model

Use a dual-plane design:

• Codex-native plane: use web.search_query, web.open, web.find, GitHub app tools, Context7 MCP when explicitly useful, Exa MCP, and $opensrc from the session. These tools are available to Codex, not to the Rust CLI.
• CLI plane: use codex-research for provider routing, Context7 REST API, GitHub REST/gh fallback, Firecrawl calls, direct fetch probes, SQLite/CAS cache state, JSONL ledgers, Markdown reports, doctor output, and evals.