Vyper — 122 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Vyper code through the act MCP server. 122 operations available: 48 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.

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18Query
48Refactor
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-address-check Insert an assert checking address != empty(address) at the start of a function
add-array-bounds-check Insert assert index < length before array access in a function
add-assert-guard Insert an assert condition at the start of a function
add-check-effects-interactions Insert CEI pattern comment markers at the start of a function body
add-decorator Add a decorator to a function
add-event-emission Append a log EventName(...) statement to a function body
add-immutable-keyword Convert a state variable to immutable(T) syntax
add-import Add an import statement to the file
add-interface-stub Generate an interface definition from a function's public signature
add-msg-sender-check Insert assert msg.sender == self.owner at the start of a function
add-nonreentrant-guard Add @nonreentrant decorator to a function for reentrancy protection
add-require-guard Insert a require-style assert with a user-facing message at the start of a function
add-return-type Add or update the return type annotation on a function
add-try-except Wrap an external call with raw_call and revert_on_failure=False safety pattern
add-type-annotation Add an explicit type annotation to a local variable assignment
add-zero-check Insert assert divisor != 0 before a division/modulo expression
convert-if-to-ternary Convert a simple if/else assignment into a ternary expression
convert-string-type Convert a type annotation between String[N], Bytes[N], and bytes32
convert-ternary-to-if Convert a ternary expression into a full if/else block
convert-to-interface Extract all external/view function signatures into an interface block
extract-constant Extract a literal value into a named constant(T) at contract scope
extract-function Extract a block of code into a new @internal def function
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-assertion-message Generate an assertion with human-readable message for a condition
generate-constructor Generate an @deploy def __init__(): function with initialization of state variables
generate-event-definition Generate an event definition with typed parameters
generate-getter Generate a @view @external def get_{name}() -> T: function for a state variable
generate-interface Generate an interface block from all external functions
generate-owner-pattern Generate owner state variable and _check_owner() internal function
generate-setter Generate an @external def set_{name}(value: T): function with ownership check
generate-test-harness Generate a test contract stub that wraps and calls functions from the contract
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-constant Replace all references to a named constant with its literal value
inline-function Replace a call to a simple internal function with the function's body inline
inline-import Remove an import alias and replace all uses with the direct module path
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)]
invert-conditional Invert an if/else block (swap branches and negate condition)
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)]
optimize-storage-layout Reorder state variable declarations to minimize storage slots
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-unused-import Remove an import statement that is never referenced in the file
remove-unused-variable Remove a local variable declaration that is never read after assignment
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 state variable, function, constant, or event across all references
rename-magic-number Extract a numeric literal into a named constant and replace all occurrences
replace-loop-with-builtin Replace a for loop with a simpler range() pattern or annotate it
split-function Extract a contiguous block of lines from a function into a new @internal helper

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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