Elm — 124 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Elm code through the act MCP server. 124 operations available: 50 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
50Refactor
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-exposing-clause Add an exposing (...) clause to a bare import
add-import Add a missing import for a module
add-missing-pattern-cases Add all missing case branches for a union type
add-type-annotation Add explicit type signature to a function
convert-case-to-if-then-else Convert a simple two-branch True/False case expression to if-then-else
convert-function-to-lambda Convert a simple function definition to a lambda expression
convert-if-then-else-to-case Structural refactor from if-then-else to a case expression
convert-lambda-to-function Convert a lambda expression to a named top-level function
convert-string-concat-to-interpolation Convert ++ string concatenation to String.concat [...] form
extract-function Extract a block of code into a new top-level function
extract-type-alias Extract a repeated type annotation into a type alias
extract-value Extract an expression into a named let binding
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-case-expression Generate a case expression for a union type
generate-default-case Add catch-all case branch to a case expression
generate-equality Generate a custom equality function for a record type
generate-function Generate a new top-level Elm function with an optional type signature
generate-function-documentation Generate documentation comment for a function
generate-impl-stubs Generate stub implementations for a list of function signatures
generate-missing-cases Generate all missing branches for exhaustive pattern matching
generate-module-documentation Generate module-level documentation comment
generate-test-function Generate an elm-test scaffold test function
generate-to-string Generate a toString helper function for a custom type
generate-type-annotation Generate type annotation for a function
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 a function call by substituting the function body
inline-let-binding Inline a let binding by substituting its value
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-case-expression Convert an if-then-else expression to a case expression on True/False
introduce-maybe-case Wrap a Maybe expression in a case with Nothing/Just branches
introduce-pipe-operator Convert nested function calls to |> pipeline
introduce-result-case Add Ok/Err case handling for Result values
merge-imports Merge duplicate imports for the same module into one
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)]
organize-imports Sort and merge duplicate imports
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-dead-code Remove unreferenced top-level definition
remove-unused-import Remove an import that is not referenced in the module
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-custom-type Rename a custom type (union type) and update all type annotations
rename-function Rename a function (definition + all call sites)
rename-identifier Rename a variable or value across all references in the file
rename-record-field Rename a record field across access and update expressions
rename-type-alias Rename a type alias and all usages in annotations
rename-type-constructor Rename a variant of a custom type across definition, pattern matches, and call sites
simplify-list-construction Simplify List.singleton, [x]++[y], or List.cons x [] to concise form
simplify-list-operation Replace verbose list operations with built-in functions (e.g. List.length == 0 → List.isEmpty)
sort-imports Sort import statements alphabetically
update-exposing-clause Update the symbols listed in an exposing clause

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

← ElixirElvish →