Ruby — 207 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Ruby code through the act MCP server. 207 operations available: 133 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

133Refactor

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-attr-accessor`	Create explicit attr_accessor from getter+setter
`add-attr-class-variable`	Add @@var class variable
`add-attr-reader`	Create explicit attr_reader from getter method
`add-attr-writer`	Create explicit attr_writer from setter method
`add-ensure-clause`	Add ensure block for cleanup
`add-namespace`	Wrap code in module Namespace; end
`add-raise-statement`	Add explicit raise for error condition
`add-self-parameter`	Explicit self in class method definition
`add-type-comment`	Add @type [Type] comment for static analysis
`change-signature`	Modify function parameters, return, generics
`change-visibility`	Change method access level (private/protected/public)
`convert-block-to-lambda`	Convert block to lambda declaration
`convert-block-to-proc`	Convert block to &:method_name syntax
`convert-braces-to-do-end`	Convert { } block to do...end
`convert-case-to-if`	Convert case statement to if/elsif
`convert-class-to-module`	Convert class to module (if no constructor)
`convert-do-end-to-braces`	Convert do...end block to { }
`convert-double-to-single-quotes`	Double quote to single quote literals
`convert-each-to-for`	Convert .each to for loop
`convert-exception-to-specific-type`	Make rescue catch specific exception type
`convert-for-to-each`	Convert for loop to .each iteration
`convert-for-to-while`	Convert for loop to while
`convert-heredoc-to-string`	Convert heredoc back to string literal
`convert-if-else`	Convert between if-else patterns
`convert-if-to-case`	Convert multiple elsif to case
`convert-if-to-unless`	Convert if !x to unless x
`convert-lambda-to-block`	Convert lambda to block when passed to method
`convert-loop-to-break`	Convert loop to conditional iteration
`convert-method-body-to-one-liner`	Collapse multi-line method to single line
`convert-method-to-property`	Convert accessor method to attr_accessor
`convert-modifier-if`	Convert if modifier to block form
`convert-module-to-class`	Convert module to class
`convert-one-liner-to-method-body`	Expand one-liner to multi-line
`convert-percent-literal-to-string`	Convert %w() word array to string literal
`convert-proc-to-block`	Convert proc parameter to explicit block
`convert-property-to-method`	Convert attr_accessor to explicit getter/setter
`convert-require-relative-to-require`	Convert require_relative to require
`convert-require-to-require-relative`	Convert require to require_relative
`convert-rescue-to-rescue-in-method`	Extract rescue to method-level
`convert-single-to-double-quotes`	Single quote to double quote literals
`convert-singleton-to-class-method`	Convert singleton method to class method definition
`convert-string-to-symbol`	Convert string to symbol for hash keys
`convert-symbol-to-string`	Convert symbol to string literal
`convert-ternary`	Convert ternary expressions and conditionals
`convert-to-guard-clause`	Extract common condition to guard at method start
`convert-to-heredoc`	Convert string to heredoc for multiline
`convert-to-rbs-signature`	Convert method to RBS type signature format
`convert-to-safe-navigation`	Convert if check to safe navigation operator (&.)
`convert-to-string-interpolation`	Convert string concatenation to interpolation
`convert-unless-to-if`	Convert unless x to if !x
`convert-while-to-for`	Convert while loop to for
`copy-method`	Duplicate method declaration
`delete`	Delete unused symbol
`extract-block-parameter`	Name unnamed block parameters
`extract-class`	Extract methods/fields to new class
`extract-constant`	Extract value to named constant
`extract-method`	Extract code into a new 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)]
`generate-accessors`	Generate attr_reader, attr_writer, attr_accessor
`generate-class`	Generate new class skeleton
`generate-class-methods-block`	Generate class << self section
`generate-clone`	Generate clone (deep copy)
`generate-comparable-implementation`	Generate <=> for sorting
`generate-constructor`	Generate initialize method from class variables
`generate-custom-exception`	Generate custom exception class
`generate-debug-print`	Add debug output statement
`generate-define-method`	Generate define_method for dynamic methods
`generate-dup`	Generate dup (shallow copy)
`generate-enum-like-class`	Generate class with enum-like constants
`generate-enumerable-delegation`	Generate include Enumerable with iteration
`generate-equals`	Generate ==, !=, eql? implementations
`generate-example-usage`	Generate usage examples in comments
`generate-fixture-method`	Generate test fixture setup
`generate-getter-method`	Generate a getter method for an instance variable
`generate-guard-statements`	Generate nil/type guards at method start
`generate-hash`	Generate hash for use in collections
`generate-initialize-from-attributes`	Generate initialize accepting attribute hashes
`generate-inspect`	Generate inspect method
`generate-keyword-initialize`	Generate keyword argument initialize(**kwargs)
`generate-method-missing`	Generate method_missing handler
`generate-method-signature-doc`	Generate method signature documentation
`generate-mixin`	Generate module for inclusion as mixin
`generate-mock-object`	Generate mock/stub object for testing
`generate-module`	Generate module with namespace
`generate-precondition-checks`	Generate argument validation
`generate-rdoc-comment`	Generate RDoc documentation skeleton
`generate-respond-to-missing`	Generate respond_to_missing?
`generate-setter-method`	Generate a setter method for an instance variable
`generate-singleton-class`	Generate singleton methods for object
`generate-subclass`	Generate subclass extending parent
`generate-tests`	Generate test method skeleton
`generate-to-h`	Generate to_h for hash conversion
`generate-to-string`	Generate to_s string representation
`generate-todo-comment`	Generate TODO/FIXME placeholder
`generate-validation-method`	Generate method for parameter validation
`generate-with-index-iteration`	Generate each_with_index method
`import-add`	Add require statement
`import-organize`	Organize and sort requires
`import-remove`	Remove unused require 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-method`	Inline method body at call sites
`inline-variable`	Inline variable at all references
`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-variable`	Extract expression to local variable
`invert-if-else`	Swap if and else branches, negate condition
`join-string-literals`	Concatenate adjacent string literals
`make-method-instance`	Convert class method to instance method
`make-method-static`	Convert instance method to class method
`merge-nested-if`	Merge nested if conditions into compound condition
`merge-rescue-clauses`	Combine multiple rescue handlers
`move`	Move method to another class/module
`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.
`remove-attr-class-variable`	Convert class variable to instance variable
`remove-empty-else`	Remove empty else clause
`remove-empty-rescue`	Remove rescue clause that does nothing
`remove-redundant-require`	Remove duplicate or unnecessary require
`remove-safe-navigation`	Convert &.method to .method when safe
`remove-self-parameter`	Remove explicit self when not needed
`remove-type-comment`	Remove type comment annotation
`remove-unnecessary-block`	Remove block when method doesn't use it
`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
`simplify-boolean-assignment`	Simplify x = x \|\| y to x \|\|= y
`sort-method-declarations`	Sort methods by visibility (private/public)
`split-if-condition`	Split compound if into nested if
`split-string-literal`	Split long string into multiple parts
`swap-statements`	Reorder two adjacent statements
`wrap-in-begin-rescue`	Wrap statement in exception handler
`wrap-null-check`	Wrap expression in nil check guard
`wrap-try-catch`	Wrap code in begin...rescue...end 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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