Haskell — 139 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Haskell code through the act MCP server. 139 operations available: 65 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

65Refactor

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 a deriving clause to a data type
`add-type-signature`	Add type signature to a 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)]
`haskell-add-function-signature`	Add type signature to a function definition
`haskell-add-import`	Add an import statement
`haskell-add-parentheses`	Wrap expression in parentheses
`haskell-add-pattern-exhaustiveness`	Add missing patterns to exhaustive pattern matching
`haskell-collapse-nested-lets`	Merge nested let-in expressions
`haskell-convert-bind-to-do`	Convert bind operators to do notation
`haskell-convert-case-to-pattern`	Convert case expression to pattern matching
`haskell-convert-do-to-bind`	Convert do notation to bind operators
`haskell-convert-function-to-lambda`	Convert function definition to lambda expression
`haskell-convert-guards-to-if`	Convert guards to if-then-else
`haskell-convert-if-to-case`	Convert if-then-else to pattern-matching case expression
`haskell-convert-if-to-guards`	Convert if-then-else to guards
`haskell-convert-lambda-to-function`	Convert lambda expression to top-level function definition
`haskell-convert-pattern-to-case`	Convert pattern matching to case expression
`haskell-convert-point-free`	Convert point-wise to point-free style
`haskell-convert-point-wise`	Convert point-free to point-wise style
`haskell-delete-declaration`	Delete a top-level declaration
`haskell-expand-import`	Expand import to expose more symbols
`haskell-extract-let-binding`	Extract expression to let binding
`haskell-extract-where-binding`	Extract expression to where binding
`haskell-generate-algebraic-datatype`	Generate algebraic data type with constructors
`haskell-generate-comment`	Generate Haddock documentation comment
`haskell-generate-eq-instance`	Generate Eq typeclass instance with == and /=
`haskell-generate-function-stub`	Generate function definition stub with type signature and pattern cases
`haskell-generate-instance-stub`	Generate typeclass instance stub
`haskell-generate-lens`	Generate lens for record fields
`haskell-generate-main-function`	Generate main function skeleton
`haskell-generate-module-declaration`	Generate module declaration
`haskell-generate-module-export-list`	Generate explicit module export list
`haskell-generate-ord-instance`	Generate Ord typeclass instance with compare and operators
`haskell-generate-pattern-matching`	Generate exhaustive case expression for a datatype
`haskell-generate-record-definition`	Generate record datatype with fields and default values
`haskell-generate-show-instance`	Generate Show typeclass instance with show method
`haskell-generate-smart-constructor`	Generate smart constructor for a data type
`haskell-generate-type-alias`	Generate type alias definition
`haskell-generate-typeclass-instance`	Generate typeclass instance stub with methods
`haskell-inline-let-binding`	Inline a let-bound value at its usage site
`haskell-inline-where-binding`	Inline a where binding
`haskell-introduce-intermediate-binding`	Extract sub-expression to intermediate let binding
`haskell-introduce-let-in`	Extract binding to let-in expression
`haskell-introduce-where-clause`	Extract helper definitions into where block
`haskell-organize-imports`	Organize and sort imports
`haskell-qualify-import`	Add qualified alias to an import
`haskell-remove-let-in`	Inline let-in binding and consolidate scope
`haskell-remove-parentheses`	Remove unnecessary parentheses
`haskell-remove-redundant-binding`	Eliminate unused bindings
`haskell-remove-type-annotation`	Remove redundant type annotation
`haskell-rename-record-field`	Rename a record field across all accessors and updates
`haskell-rename-type-constructor`	Rename a data type constructor across all usages
`haskell-rename-type-variable`	Rename a type variable across function signature
`haskell-separate-let-bindings`	Split multi-statement let into separate bindings
`haskell-swap-function-arguments`	Reorder function parameters
`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 definition at all call sites
`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)]
`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-import`	Remove an unused import statement
`remove-redundant-pattern`	Remove a redundant or unreachable pattern from pattern matching
`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-identifier`	Rename a variable, function, or type across all references

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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