OCaml — 129 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze OCaml code through the act MCP server. 129 operations available: 55 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

55Refactor

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-deriving`	Add deriving attribute to type definition
`add-open-statement`	Add open statement for module
`add-option-none-check`	Add explicit Some/None match for Option value
`add-rec-keyword`	Add rec keyword to enable mutual recursion
`add-record-field`	Add new field to record type and initialize in all bindings
`add-type-annotation`	Add explicit type annotation to binding or parameter
`change-visibility`	Change value visibility by adding/removing from .mli signature
`convert-for-loop-to-fold`	Convert for-loop to List.fold_left or Array.fold_left
`convert-for-loop-to-iter`	Convert for-loop to List.iter or Array.iter
`convert-for-loop-to-map`	Convert for-loop with accumulator to List.map or Array.map
`convert-fun-to-function`	Convert fun x → match x with to function keyword
`convert-function-to-fun`	Convert function keyword to explicit fun x → match x with
`convert-if-to-pattern-match`	Convert if-then-else to pattern match for better idiom expression
`convert-immutable-to-mutable`	Convert immutable let-binding to mutable ref when mutation needed
`convert-mutable-to-immutable`	Replace mutable reference (ref) with immutable let-binding
`convert-pattern-match-to-if`	Convert simple pattern match to if-then-else expression
`convert-string-concatenation-to-format`	Convert s1 ^ s2 to Format module formatting
`convert-string-concatenation-to-sprintf`	Convert s1 ^ s2 to Printf.sprintf format string
`convert-to-labeled-args`	Convert positional arguments to labeled parameters
`convert-to-option-bind`	Wrap Option handling with Option.bind/map chain
`convert-while-to-recursion`	Convert while-loop to tail-recursive function
`extract-constant`	Extract value to named constant
`extract-function`	Extract code range to new function
`extract-module-signature`	Extract .mli signature from .ml implementation
`extract-module-type`	Extract module type (signature) from module implementation
`extract-type-alias`	Create type alias for repeated complex type expression
`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)]
`generate-function-from-usage`	Generate function stub from call site with inferred signature
`generate-module-interface`	Generate .mli file with type signatures for module
`generate-module-stub`	Generate minimal .ml module implementation from .mli
`generate-module-type-impl-stubs`	Generate implementation stubs for all values in a module type
`generate-option-handling`	Generate Option.map/bind pattern for optional value handling
`generate-pattern-match-cases`	Generate match cases for variant type covering all constructors
`generate-record-accessor`	Generate accessor function for record field
`generate-record-constructor`	Generate function to construct record with all fields
`generate-record-setter`	Generate functional setter (returns new record with updated field)
`generate-record-type`	Generate record type definition from field list
`generate-result-handling`	Generate Result.map/bind pattern for error handling
`generate-test-case`	Generate test function skeleton for Alcotest framework
`generate-variant-match-check`	Generate pattern match with exhaustiveness verification
`generate-variant-type`	Generate variant type definition from cases
`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)]
`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)]
`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)]
`open-alias`	Create module alias (module M = Long.Module.Path) for brevity
`open-module-locally`	Wrap code block in local open statement
`organize-opens`	Sort and group open statements
`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.
`remove-function-parameter`	Remove unused parameter and update call sites
`remove-open-statement`	Remove unused open statement
`remove-record-field`	Remove field from record type and update all record literals
`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-record-field`	Rename record field across type definition and all access sites
`wrap-result`	Wrap exception handling with Result type

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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