JavaScript — 145 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze JavaScript code through the act MCP server. 145 operations available: 71 refactor, 18 query, 42 analysis, 14 verification. Each operation is callable from Claude Code, Cursor, Codex, OpenCode, or any MCP-compatible agent host. Click any operation for a stable anchor link suitable for citation.

18Query

71Refactor

42Analysis

14Verify

Query

18 query tools, the same on every supported language. Descriptions live in the shared reference: /docs/query-tools.

callers control_flow data_flow definition diagnostics effect_closure effect_summary fix_auto get_type graph import_organize interface mutations references repo_outline skeleton symbols symbols_batch

Refactor

Operation	Description
`add-nullish-coalescing`	Add nullish coalescing operator
`add-numeric-separators`	Add numeric separators to large numbers
`add-optional-chaining`	Add optional chaining operator
`add-type-import`	Add `type` modifier to an import statement
`change-signature`	Change function signature
`change-visibility`	Change member visibility
`convert-arrow`	Convert function to arrow function
`convert-async`	Convert between async/sync
`convert-callback-to-promise`	Convert callback pattern to Promise
`convert-class-to-function`	Convert ES6 class to constructor function
`convert-commonjs-to-esm`	Convert CommonJS to ES modules
`convert-concat`	Convert array concatenation methods
`convert-const-to-var`	Convert const to var
`convert-esm-to-commonjs`	Convert ES modules to CommonJS
`convert-for`	Convert between for loop variants
`convert-foreach`	Convert for loop to forEach
`convert-if-else`	Convert between if-else and ternary
`convert-if-to-switch`	Convert if-else chain to switch statement
`convert-promise-chain-to-async`	Convert `.then()`/`.catch()` promise chain to async/await
`convert-prototype-to-class`	Convert prototype pattern to ES6 class
`convert-require-to-import`	Convert `require()` call to ES module `import`
`convert-sync`	Convert async function to sync
`convert-template`	Convert string concatenation to template literals
`convert-ternary`	Convert ternary to if-else
`convert-var-to-block-scope`	Convert var to block-scoped declaration
`convert-var-to-const`	Convert var to const
`convert-var-to-let`	Convert var to let
`encapsulate`	Encapsulate field with accessors
`extract-class`	Extract methods/fields to new class
`extract-constant`	Extract value to named constant
`extract-function`	Extract code into a new function
`extract-method`	Extract selected code into a new class method
`extract-variable`	Extract expression to variable
`extract_function`	Extract a code selection into a new function — automatically infers parameters, return types, and inserts the call site. Use instead of manually cutting/pasting code. Works without LSP; LSP improves type inference. Params: file (string), new_name (string), start_line (u32), start_column (u32), end_line (u32), end_column (u32) [, preview (bool), receipt (bool)]
`extract_variable`	Extract an expression into a named variable — inserts the declaration and replaces the expression with the variable name. Works without LSP. Params: file (string), new_name (string), start_line (u32), start_column (u32), end_line (u32), end_column (u32) [, preview (bool)]
`flatten`	Flatten nested structure
`generate-accessors`	Generate getters/setters for fields
`generate-builder`	Generate builder pattern
`generate-constructor`	Generate constructor from fields
`generate-equals`	Generate equals method
`generate-from-json`	Generate fromJSON static method
`generate-hash`	Generate hashCode method
`generate-tests`	Generate unit tests
`generate-to-json`	Generate toJSON method
`generate-to-string`	Generate toString method
`import-add`	Add import statement
`import-alias`	Add or change import alias
`import-organize`	Organize import statements
`import-remove`	Remove import statement
`inline`	Inline a variable, function, or method — replace every usage with its definition body, then remove the original. The inverse of extract. Works without LSP (single-file); LSP enables cross-file inlining. Params: file (string), symbol (string) [, line (u32), preview (bool), receipt (bool)]
`inline`	Inline variable or function
`insert_body`	Replace a function's implementation body with new code. AST-validated — rejects if the result has parse errors, so you can't accidentally break syntax. Use instead of manual text editing for function rewrites. Params: file (string), symbol (string), code (string) [, commit (bool)]
`introduce-field`	Introduce new field
`introduce-parameter`	Introduce new parameter
`introduce-variable`	Introduce new variable
`move`	Move symbol to another file
`move_symbol`	Move a function, class, or type to a different file and automatically update all imports across the codebase. Use instead of manually cut/paste + fixing imports. Works without LSP (single-file); LSP enables cross-file import updates. Params: file (string), symbol (string), destination (string) [, preview (bool), receipt (bool)]
`recipe_run`	Run a codemod recipe: declarative match → transform → optional verify across modeled grammars. Preview lists matches; apply writes with optional E7 receipts and all-or-nothing rollback. Returns a per-site report.
`rename`	Rename a symbol and automatically update ALL references across the codebase. Safer and faster than find-and-replace — AST-aware, won't rename strings or comments. Works without LSP (single-file); LSP enables cross-file renames. Params: file (string), old_name (string), new_name (string) [, line (u32), column (u32), preview (bool), receipt (bool)]
`rename`	Rename symbol and all references
`use-destructuring`	Use destructuring for assignments
`use-logical-assignment`	Use logical assignment operators
`use-object-shorthand`	Use object property shorthand
`use-private-fields`	Use private class fields
`use-rest-parameters`	Use rest parameters instead of arguments
`use-spread-operator`	Use spread operator for arrays/objects
`use-template-literals`	Use template literals for string interpolation
`use-top-level-await`	Replace async IIFE wrapper with top-level await
`wrap-if`	Wrap in if statement
`wrap-null-check`	Wrap in null check guard
`wrap-try-catch`	Wrap in try-catch block

Analysis

42 analysis tools, the same on every supported language. Descriptions live in the shared reference: /docs/analysis-tools.

analyze_api_diff analyze_chokepoints analyze_clones analyze_clusters analyze_cohesion analyze_conformance analyze_coupling analyze_cycle_risk analyze_cycles analyze_dead_code analyze_depth analyze_entry_points analyze_export analyze_extraction analyze_fan_balance analyze_features analyze_hotspots analyze_impact analyze_inconsistencies analyze_inheritance analyze_interface_bloat analyze_interfaces analyze_layers analyze_orphan_types analyze_patterns analyze_platform_deps analyze_readiness analyze_roles analyze_seams analyze_stability analyze_surface analyze_test_gaps analyze_thickness analyze_type_completeness churn_hotspots co_change_clusters coverage_overlay ownership_map profile_overlay simulate split_module trace_overlay

Verify

14 verify tools, the same on every supported language. Descriptions live in the shared reference: /docs/verification.

bisect_regression gate generate_test_harness scan secret_surface summarize_pr taint_flow unsafe_surface verify_behavioral_equivalence verify_contract_preserved verify_diff_semantics verify_port_parity verify_side_effects verify_test_impact

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