Use when Codex needs language-server diagnostics, definitions, references, symbols, or rename safety checks in the current workspace.
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See how to installReview the instructions the agent will receive before you install.
Call lsp MCP tools through the tool interface; lsp.*/mcp__lsp__* are tool-call names, not shell commands.
lsp.status: list configured, installed, missing, disabled, and active language servers.lsp.diagnostics: check one file or directory for LSP diagnostics. Prefer severity: "error" after edits.lsp.goto_definition: locate a symbol definition from file, line, and character.lsp.find_references: find usages of a symbol across the workspace.lsp.symbols: inspect document symbols or search workspace symbols.lsp.prepare_rename: check whether a rename is valid at a position.lsp.rename: apply a language-server workspace edit for a rename.Project config lives at .codex/lsp-client.json; user config lives at ~/.codex/lsp-client.json.
{
"lsp": {
"typescript": {
"command": ["typescript-language-server", "--stdio"],
"extensions": [".ts", ".tsx", ".js", ".jsx"]
}
}
}
Use lsp.status first when diagnostics report a missing language server.
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Searches and rewrites code by AST shape across 25 languages. Use when the target is a syntax pattern (every call/class/import shaped like X, a codemod, a YAML rule) rather than literal text; for plain strings, comments, or filenames, use rg.
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Drives a real browser through the omowright library from the js eval kernel: sites the user is already signed into, forms and clicks, JS-rendered pages, screenshots, web QA, extension popups, a human handoff for login, CAPTCHA or OTP, and a browser you own for scraping, bot-scored targets, network capture and QA traces. Use for any interactive browser task; not for a plain search or an unblocked static fetch.
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Finds, reads, and reconstructs coding-agent sessions across Codex, Claude, OpenCode, OMO/Senpi, and other local agent logs. Use when asked to find or search past sessions, transcripts, or subagent runs, or to recover what an earlier session did.
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Use when Codex needs to understand or respond to automatic comment-checker feedback emitted after an edit-like PostToolUse hook.
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Processes and analyzes data with resident-kernel engines (DuckDB, Polars) and one-shot tools. Use for CSV/parquet/JSON analysis, group-by/join/aggregation, time series, distributions, cleaning, or plotting a dataset.
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Runs a hypothesis-driven debugging loop across any language or binary, escalating to orthogonal oracle angles and locking the fix with a failing test. Use for crashes, silent failures, hangs, wrong responses, memory leaks, async misbehavior, or reverse engineering.
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