Scala — 128 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Scala code through the act MCP server. 128 operations available: 54 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
54Refactor
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-access-modifier Add access modifier (private/protected/public)
add-default-parameter Add default value to parameter
add-import Add missing import statement
add-missing-match-case Add missing case to pattern match
add-result-type-annotation Add explicit return type to function
change-visibility Change access modifier
convert-class-to-case-class Convert class to case class
convert-concat-to-interpolation Convert string concatenation to s-string interpolation
convert-for-to-foreach Convert for comprehension to foreach call
convert-foreach-to-for Convert foreach call to for comprehension
convert-function-to-method Convert function to class method
convert-ifelse-to-match Convert if-else chain to pattern match
convert-loop-to-comprehension Convert for loop to for-comprehension with yield
convert-map-filter-to-comprehension Convert map/filter chain to for-comprehension
convert-method-to-function Convert method to standalone function
convert-var-to-val Convert mutable var to immutable val
explicit-type-annotation Add explicit type annotation
extract-constant Extract value to named constant
extract-function Extract code block into new function
extract-interface Extract interface from class methods
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 getter for field
generate-case-class-boilerplate Generate case class from existing class
generate-constructor Generate constructor
generate-copy-method Generate copy method for a class
generate-equals Generate equals and hashCode methods
generate-match-cases Generate pattern match cases
generate-sealed-subclasses Generate subclasses for sealed trait/class
generate-setter Generate setter for field
generate-tests Generate unit test scaffold
generate-to-string Generate toString method
generate-trait-implementation Generate trait implementation with method stubs
implement-sealed-subclass Generate case class subclass for sealed trait/class
import-alias Add alias to import
import-organize Sort and deduplicate imports
import-remove Remove unused import
initialize-field Add initialization to an uninitialized field
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-function Inline function call into call site
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-field Promote variable to class field
move Move class or method 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.
remove-result-type-annotation Remove redundant return type
remove-type-annotation Remove redundant type annotation
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
split-declaration-and-assignment Split declaration and assignment
wrap-null-check Wrap expression in null-safe check

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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