Tact — 132 Operations for AI Agents

Tact contracts run on TON, where message-passing and gas discipline shape every design. act101 gives agents the contract's receivers, getters, and structs as a map, so on-chain logic stays navigable.

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Tact code through the act MCP server. 132 operations available: 58 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

58Refactor

42Analysis

14Verify

Worked Tact examples

act101 parses Tact with the tree-sitter grammar and edits contracts, structs, and messages as syntax nodes, so a modifier change or a field addition lands on the exact declaration it targets. It can turn a plain function into an externally-readable getter by adding the get modifier. It can add a new field to an existing struct, contract, or message body. And it can extract a chosen subset of a struct's fields into a new nested struct, replacing them in the original with a single field of the new type. Each example below is the verbatim output of the command shown, run against the file shown.

Convert a function to a getter

balance.tact declares balance as a plain function.

$ act refactor-lang convert_to_getter --file balance.tact --params '{"function_name":"balance","line":1,"column":1}'

Before

fun balance(): Int { 100 }

After

get fun balance(): Int { 100 }

get is inserted before fun, making balance externally readable.

Add a field to a struct

point.tact's Point struct has x and y fields.

$ act refactor-lang add_field --file point.tact --params '{"container_name":"Point","field_name":"z","field_type":"Int","line":1,"column":1}'

Before

struct Point { x: Int; y: Int; }

After

struct Point { x: Int; y: Int; z: Int; }

A z: Int field is appended to Point's field list.

Extract fields into a nested struct

account.tact's Account struct mixes an identity field (owner), a mutable counter (nonce), and a balance in one flat declaration.

$ act refactor-lang extract_struct --file account.tact --params '{"struct_name":"Account","new_struct_name":"AccountMeta","new_field_name":"meta","field_names":["owner","nonce"],"line":1,"column":1}'

Before

struct Account { owner: Address; balance: Int; nonce: Int; }

After

struct AccountMeta { owner: Address; nonce: Int; }
struct Account { meta: AccountMeta; balance: Int; }

owner and nonce move into a new AccountMeta struct; Account keeps balance and gains a single meta: AccountMeta field in their place.

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-bounced-handler`	Insert a bounced handler for a message into a Tact contract body.
`add-constant`	Add a top-level Tact constant declaration.
`add-field`	Add a field to a Tact struct/contract/message body.
`add-gas-check`	Insert an acceptMessage() gas-acceptance call at the start of a Tact function body.
`add-init-parameter`	Add a parameter to a Tact contract's init signature and a matching self-assignment, creating init if absent.
`add-opcode-annotation`	Add or update the message(opcode) annotation on a Tact message type.
`add-receiver`	Insert a receive handler for a message into a Tact contract body.
`change-opcode`	Change an existing message opcode value on a Tact message type.
`convert-getter-to-internal`	Convert a Tact getter function back to internal by removing the get modifier.
`convert-map-to-structs`	Replace a Tact map<K,V> field with a struct-typed field.
`convert-message-to-struct`	Convert a Tact message into a struct by dropping the opcode and changing the keyword.
`convert-send-parameters-to-builder`	Introduce a beginCell()-constructed body field into a Tact SendParameters instance inside a send() call.
`convert-struct-to-message`	Convert a Tact struct into a message by inserting an opcode and changing the keyword.
`convert-to-getter`	Convert a Tact function into an externally-readable getter by adding the get modifier.
`convert-to-map`	Convert named Tact struct fields into a single map<K,V> field.
`convert-to-mixin`	Compose a named Tact trait into the first contract via the with clause.
`extract-function`	Extract selected Tact lines into a new function and replace them with a call.
`extract-mixin`	Move named Tact top-level functions into a newly-created trait.
`extract-struct`	Extract selected fields from a Tact struct into a new nested struct.
`extract-to-contract`	Move named top-level Tact declarations (struct/message/const/function) into a new contract body.
`extract-to-trait`	Extract selected Tact functions' declarations into a new top-level trait.
`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)]
`fix-bounced-handler-signature`	Correct a Tact contract's bounced() parameter type to a given message type.
`fix-gas-limit-exceeded`	Insert an acceptMessage() gas-acceptance call at the start of a Tact function body.
`fix-invalid-message-opcode`	Set a valid opcode on a Tact message type (add or replace message_value).
`fix-missing-init`	Add an init() to a Tact contract initializing its uninitialized storage fields.
`fix-uninitialized-field`	Initialize a Tact contract's uninitialized storage field in init().
`gen-contract-scaffold`	Generate a minimal Tact contract scaffold (init/receive/getter stubs).
`gen-deployment-script`	Generate a minimal Tact deployment scaffold contract (Tact has no native deploy syntax).
`gen-dex-pool-contract`	Generate a minimal Tact DEX pool contract scaffold.
`gen-getter-function`	Generate a Tact get-function stub wrapped in a contract.
`gen-jetton-contract`	Generate a minimal Tact Jetton minter scaffold (not TEP-74 complete).
`gen-message-definition`	Generate a Tact message(opcode) type definition scaffold.
`gen-multisig-contract`	Generate a minimal Tact multisig wallet scaffold.
`gen-nft-contract`	Generate a minimal Tact NFT collection scaffold (not TEP-62 complete).
`gen-receiver-function`	Generate a Tact receive() handler stub for a message, wrapped in a contract.
`gen-test-scaffold`	Generate a minimal Tact test scaffold contract (Tact has no native test syntax).
`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 simple single-expression Tact function at its same-file call sites.
`inline-struct`	Inline a single-use Tact struct's fields into its parent struct.
`inline-trait`	Inline a Tact trait's member functions to top level and remove the trait declaration.
`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-bounced-handler`	Remove the bounced handler for a message from a Tact contract.
`remove-constant`	Remove a top-level Tact constant and substitute same-file references with its value.
`remove-field`	Remove an unused field from a Tact struct/contract/message body.
`remove-gas-check`	Remove an acceptMessage() gas-acceptance call from a Tact function body.
`remove-init-parameter`	Remove a parameter from a Tact contract's init signature and its matching self-assignment.
`remove-receiver`	Remove the receive handler for a message from a Tact contract.
`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-contract`	Rename a Tact contract and same-file references.
`rename-field`	Rename a Tact struct/contract/message field and same-file access/instance sites.
`rename-function`	Rename a Tact function and same-file direct call sites.
`rename-message`	Rename a Tact message and same-file type/constructor references.
`rename-struct`	Rename a Tact struct and same-file type/constructor references.
`reorder-fields`	Reorder the fields of a Tact struct/contract/message into a new order.

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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