Kotlin — 117 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Kotlin code through the act MCP server. 117 operations available: 43 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

43Refactor

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-elvis-operator`	Add elvis operator (?:) for null safety
`add-reified-type-parameter`	Mark type parameter as reified for runtime type access
`add-safe-call`	Wrap member access in safe call operator (?.) for null-safe navigation
`change-parameter-type`	Change parameter type and update call sites
`change-return-type`	Change function return type and update signature
`change-signature`	Modify function parameters, return, generics
`convert-block-to-function-expression`	Convert block body function to expression body function
`convert-function-expression-to-block`	Convert expression body function to block body function
`convert-function-to-lambda`	Convert simple function to lambda expression
`convert-lambda-to-function`	Convert lambda expression to named function for improved readability
`convert-to-companion-object`	Move class-level functions/properties into companion object
`convert-to-data-class`	Convert class to data class with auto-generated equals/hashCode
`convert-to-extension-function`	Convert instance method to extension function
`convert-to-object-declaration`	Convert singleton class to object declaration
`convert-to-property`	Convert field + getter/setter to property
`convert-to-scope-function`	Convert object usage to scope function (let/run/apply/also/with)
`convert-to-sealed-class`	Convert class hierarchy to sealed class
`convert-to-string-template`	Convert string concatenation to Kotlin string template
`convert-to-when-expression`	Convert if-else chain to Kotlin when expression
`encapsulate`	Make field private, generate getter/setter
`extract-class`	Extract methods/fields to new class
`extract-constant`	Extract value to named constant
`extract-interface`	Create interface from class
`extract-property`	Extract expression into class property with backing field
`extract-type-alias`	Extract complex type into type alias
`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-class-from-interface`	Generate a class implementation from a Kotlin interface
`generate-component-accessors`	Generate componentN() accessors for destructuring
`generate-copy-method`	Generate copy() method for immutable updates
`generate-data-class`	Generate data class with auto-generated methods
`generate-elvis-default`	Append an Elvis operator with a default value to a nullable expression
`generate-method`	Generate a new method stub in a Kotlin class
`generate-null-check-guard`	Generate a null-check guard wrapping a statement
`generate-override-method`	Generate an override method stub in a Kotlin class
`generate-primary-constructor`	Generate a primary constructor for a Kotlin class
`generate-when-branches`	Generate when branches for enum/sealed class variants
`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-to-companion-object`	Move static-like function to companion object
`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)]

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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