Noir — 127 Operations for AI Agents

Noir brings zero-knowledge programs to developers who think in functions, not constraints. act101 reads Noir's structure natively, so agents navigate circuits and their proofs-in-progress like ordinary code.

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Noir code through the act MCP server. 127 operations available: 53 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.

Premium language. Operations on Noir require an Elite license or above. See pricing.

18Query

53Refactor

42Analysis

14Verify

Worked Noir examples

act101 parses Noir with the tree-sitter grammar and edits functions, structs, and their attributes as syntax nodes, so an attribute, modifier, or generated scaffold lands on the exact construct it targets. It can insert the #[fold] attribute immediately before a function declaration. It can insert the unconstrained modifier before a function's visibility and fn keyword. It can append a new function skeleton with one private input and one output, added after the functions already in the file. It can append a #[test] function that exercises a named public entrypoint with a sample input. And it can add a new field to an existing struct Storage declaration. Each example below is the verbatim output of the command shown, run against the file shown.

Add a fold attribute to a function

compose.nr declares compose with no attributes.

$ act refactor-lang add_fold_attribute --file compose.nr --params '{"function_name":"compose","line":1,"column":1}'

Before

fn compose(x: Field) -> Field {
    x
}

After

#[fold]
fn compose(x: Field) -> Field {
    x
}

#[fold] is inserted immediately above fn compose.

Convert a function to unconstrained

hash.nr declares hash as an ordinary pub fn.

$ act refactor-lang convert_to_unconstrained --file hash.nr --params '{"function_name":"hash","line":1,"column":1}'

Before

pub fn hash(x: Field) -> Field {
    x
}

After

unconstrained pub fn hash(x: Field) -> Field {
    x
}

pub fn hash gains the unconstrained modifier, reading unconstrained pub fn hash(...).

Scaffold a new function

circuit.nr already defines one function, existing.

$ act refactor-lang gen_zk_circuit_scaffold --file circuit.nr --params '{"function_name":"prove_balance","input_name":"private_input","input_type":"Field","output_type":"Field","line":1,"column":1}'

Before

fn existing(x: Field) -> Field {
    x
}

After

fn existing(x: Field) -> Field {
    x
}

fn prove_balance(private_input: Field) -> Field {
    private_input
}

A new prove_balance function is appended after existing, taking a private_input: Field and returning Field.

Generate an integration test for an entrypoint

entry.nr declares the public entrypoint public_entry, which returns its Field argument unchanged, with no test covering it.

$ act refactor-lang gen_integration_test --file entry.nr --params '{"test_name":"integration_public_entry","target_name":"public_entry","line":1,"column":1}'

Before

fn public_entry(x: Field) -> Field {
    x
}

After

fn public_entry(x: Field) -> Field {
    x
}

#[test]
fn integration_public_entry() {
    let output = public_entry(1);
    assert(output == 1);
}

A #[test] function, integration_public_entry, is appended that calls public_entry(1) and asserts the result equals 1.

Add a field to the storage struct

storage.nr declares struct Storage with a single owner: Field field.

$ act refactor-lang add_contract_storage --file storage.nr --params '{"field_name":"balance","field_type":"Field","line":1,"column":1}'

Before

struct Storage {
    owner: Field,
}

After

struct Storage {
    owner: Field,
    balance: Field,
}

balance: Field is appended as a second field inside struct Storage, after owner.

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-contract-storage`	Add a field to Noir contract storage
`add-field`	Add a field to a Noir struct
`add-fold-attribute`	Add #[fold] to a Noir function
`add-parameter`	Add a parameter to a Noir function
`change-parameter-type`	Change a Noir function parameter type
`change-return-type`	Change a Noir function return type
`convert-comptime-to-fn`	Convert a Noir comptime function to runtime execution. Refuses when the function's name occurs in the file anywhere but its own declaration and plain `name(…)` calls provably in runtime code (inside the body of a non-comptime function, in no compile-time position), inside a `quote { }` body, in another .nr file under the workspace root, or when the file does not parse.
`convert-private-to-public`	Convert a private Noir function to public
`convert-public-to-private`	Convert a public Noir function to private
`convert-to-comptime-fn`	Convert a Noir function to comptime execution. Refuses when the function's name occurs in the file anywhere but its own declaration and plain `name(…)` calls already in a comptime context (`comptime { }`, `comptime let`, a `comptime fn` body), inside a `quote { }` body, in another .nr file under the workspace root, or when the file does not parse.
`convert-to-constrained`	Convert a Noir function to constrained execution
`convert-to-global-constant`	Extract a Noir value to a global constant
`convert-to-unconstrained`	Convert a Noir function to unconstrained execution
`extract-function`	Extract selected Noir code into a new function
`extract-module`	Extract top-level declarations into an inline Noir module; refuses any use the wrap would strand
`extract-struct`	Extract Noir struct fields into a new struct. Refuses when a moved field is accessed (`x.field`), constructed (`S { field: … }`) or destructured (`S { field }`) anywhere in the file, when the source struct is used other than by its declaration, a type position or a `S::…` path, when a tracked name occurs in a `quote { }` body or another .nr file under the workspace root (a symlink or unreadable directory under the root also refuses), when the new struct name is already declared, when the new field name duplicates a field the source struct keeps, when a second struct shares the source name, when the source struct or a moved field carries an attribute, when the source struct has generic parameters, or when the file does not parse.
`extract-to-module`	Extract Noir declarations to a module file
`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-missing-import`	Add a missing Noir use statement
`fix-type-mismatch`	Fix a Noir local variable type mismatch
`fix-unconstrained-in-proof`	Fix unconstrained Noir proof logic
`fix-unused-variable`	Fix an unused Noir local variable
`gen-contract-scaffold`	Generate a Noir contract-style module scaffold
`gen-hash-function`	Generate a Noir hash function wrapper
`gen-integration-test`	Generate a Noir integration-style test
`gen-membership-proof`	Generate a Noir membership proof helper
`gen-note-scaffold`	Generate a Noir note scaffold
`gen-nullifier-check`	Generate Noir nullifier check helpers
`gen-range-proof`	Generate a Noir range proof helper
`gen-storage-layout`	Generate a Noir storage layout struct
`gen-test-function`	Generate a Noir unit test function
`gen-zk-circuit-scaffold`	Generate a Noir ZK circuit function scaffold
`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: it walks the workspace for references and refuses, naming the file, when it cannot read every candidate file; a language server makes the reference set exact. Params: file (string), symbol (string) [, line (u32), column (u32), preview (bool), receipt (bool)]. line alone resolves the symbol's one declaration on that line (refused when the line declares none or several of the name); line + column pinpoints its name
`inline-function`	Inline simple Noir function calls
`inline-global-constant`	Inline a Noir global constant
`inline-module`	Inline a Noir module into its parent scope, rewriting root `module::item` paths; refuses any use it cannot rewrite
`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)]
`merge-modules`	Merge two inline Noir modules
`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: it walks the workspace for references and refuses, naming the file, when it cannot read every candidate file; a language server makes the reference set exact. 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-contract-storage`	Remove a field from Noir contract storage
`remove-field`	Remove a Noir struct field
`remove-fold-attribute`	Remove #[fold] from a Noir function
`remove-parameter`	Remove an unused Noir function parameter
`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: it renames across the workspace and refuses, naming the file, when it cannot read every candidate file; a language server makes the reference set exact. Params: file (string), old_name (string), new_name (string) [, line (u32), column (u32), preview (bool), receipt (bool)]. line alone resolves the symbol's one declaration on that line (refused when the line declares none or several of the name); line + column pinpoints its name
`rename-field`	Rename a Noir struct field and update field access syntax
`rename-function`	Rename a Noir function and update direct call targets
`rename-module`	Rename a Noir module and update module paths
`rename-struct`	Rename a Noir struct and update type and constructor references
`rename-variable`	Rename a Noir local variable inside a function
`reorder-fields`	Reorder fields in a Noir struct
`reorder-parameters`	Reorder Noir function parameters

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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