WGSL — 129 Operations for AI Agents

This page is the canonical reference an AI coding agent uses to refactor, query, and analyze WGSL code through the act MCP server. 129 operations available: 55 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

55Refactor

42Analysis

14Verify

Worked WGSL examples

act101 parses WGSL shader source with a dedicated grammar and edits functions, struct fields, and global declarations as syntax nodes, so an attribute, a declaration keyword change, or a generated control-flow block lands on the exact node it targets. It can insert a @location(N) attribute on a struct field, binding it to a vertex attribute or fragment output slot. It can change a var declaration to const when the variable is never mutated after initialization, enabling compile-time evaluation. And it can generate an if/else template with placeholder condition and empty bodies at a target line, giving a starting point for conditional logic. Each example below is the verbatim output of the command shown, run against the file shown.

Add a location attribute to a struct field

vertex_output.wgsl's VertexOutput struct has a position field with no @location attribute.

$ act refactor-lang add_location_attribute --file vertex_output.wgsl --params '{"member_name":"position","location":0,"line":1,"column":1}'

Before

struct VertexOutput {
    position: vec4<f32>,
    color: vec4<f32>,
}

After

struct VertexOutput {
    @location(0) position: vec4<f32>,
    color: vec4<f32>,
}

@location(0) is inserted directly before position: vec4<f32>,, binding that field to output location 0.

Change a var declaration to const

compute.wgsl's compute function declares PI with var, though it is never reassigned after initialization.

$ act refactor-lang convert_var_to_const --file compute.wgsl --params '{"line":2,"column":1}'

Before

fn compute() -> f32 {
    var PI: f32 = 3.14159;
    return PI * 2.0;
}

After

fn compute() -> f32 {
    const PI: f32 = 3.14159;
    return PI * 2.0;
}

var PI: f32 = 3.14159; becomes const PI: f32 = 3.14159;, so the compiler can evaluate it at compile time.

Generate an if-else template

shade.wgsl declares an empty function f with no body statements yet.

$ act refactor-lang generate_conditional_template --file shade.wgsl --params '{"condition":"condition","has_else":true,"line":1,"column":1}'

Before

fn f(x: f32) -> f32 {
}

After

fn f(x: f32) -> f32 {
    if (condition) {
        // TODO
    } else {
        // TODO
    }
}

An if (condition) { // TODO } else { // TODO } block is inserted into the function body as a starting point.

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-explicit-type-annotation`	Add an explicit type annotation to a declaration
`add-function-attribute`	Add a @vertex/@fragment/@compute attribute to a function
`add-function-parameter`	Add a new typed parameter to a function signature
`add-location-attribute`	Add @location(N) attribute to a struct member
`add-missing-break-statement`	Add a missing break statement to a switch case
`add-return-type-annotation`	Add an explicit return type annotation to a function
`add-workgroup-size-attribute`	Add @workgroup_size attribute to a compute function
`change-storage-qualifier`	Change the storage qualifier of a var declaration
`convert-const-to-var`	Convert a const declaration to var
`convert-for-loop-to-loop`	Convert a for loop to an infinite loop with break
`convert-if-to-switch`	Convert an if-else chain to a switch statement
`convert-loop-for-to-while`	Convert a for loop to a while loop
`convert-loop-while-to-for`	Convert a while loop to a for loop
`convert-var-to-const`	Convert a var declaration to const
`convert-var-to-let`	Convert a local var declaration to let
`extract-constant`	Extract an expression into a named constant
`extract-function`	Extract lines into a new WGSL function
`extract-magic-number-to-const`	Extract a magic number literal into a named constant
`extract-variable`	Extract an expression into a named local variable
`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-compute-shader-skeleton`	Generate a complete @compute shader function skeleton
`generate-conditional-template`	Generate an if/if-else conditional template
`generate-fragment-shader-skeleton`	Generate a complete @fragment shader function skeleton
`generate-function-body`	Generate a function stub with return type placeholder
`generate-function-call-template`	Generate a call expression template for a function
`generate-loop-structure`	Generate a for, while, or loop structure template
`generate-storage-binding`	Generate a @group/@binding var<storage> declaration
`generate-storage-buffer-struct`	Generate a storage buffer struct with @group/@binding declaration
`generate-struct-initializer`	Generate a constructor helper function for a struct
`generate-struct-member-getter`	Generate a getter function for a struct member
`generate-struct-member-setter`	Generate a setter function for a struct member via pointer
`generate-switch-statement`	Generate a switch statement template with cases
`generate-uniform-binding`	Generate a @group/@binding var<uniform> declaration
`generate-uniform-buffer-struct`	Generate a uniform buffer struct with @group/@binding declaration
`generate-vertex-shader-skeleton`	Generate a complete @vertex shader function skeleton
`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 body at the call site
`inline-variable`	Inline a variable's value at its use 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)]
`invert-if-condition`	Invert the condition of an if statement
`move-variable-declaration`	Move a variable declaration closer to its first use
`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-explicit-type-annotation`	Remove an explicit type annotation from a declaration
`remove-unreachable-code`	Remove code that is unreachable after a return statement
`remove-unused-function-parameter`	Remove an unused parameter from a function signature
`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-function`	Rename a function and all its call sites
`rename-struct`	Rename a struct type across the file
`rename-struct-member`	Rename a struct member field
`rename-variable`	Rename a variable across the file
`reorder-function-parameters`	Reorder parameters in a function signature
`simplify-boolean-expression`	Simplify redundant boolean comparisons
`simplify-if-statement`	Simplify redundant patterns in an if statement condition

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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