Odin — 113 Operations for AI Agents
This page is the canonical reference an AI coding agent uses to refactor, query, and analyze Odin code through the act MCP server. 113 operations available: 39 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.
Worked Odin examples
act101 parses Odin with the tree-sitter grammar and edits import declarations, procedure declarations, and struct names as syntax nodes, so a qualifier or rename lands on the exact construct it targets. It can merge duplicate import declarations of the same package into one. It can add a package qualifier to an unqualified call, turning contains(str, substr) into strings.contains(str, substr). It can rename a struct declaration together with every literal in the file that constructs it, or rename a procedure together with every call site that references it. And it can add a field to a struct declaration, matching the indentation and trailing-comma style already in the body. It can also list a file's declarations as a skeleton, without reading the whole source. Each example below is the verbatim output of the command shown, run against the file shown. Query outputs are pretty-printed with the timing block omitted.
Merge duplicate imports
main.odin imports core:fmt twice.
$ act refactor-lang merge_imports --file main.odin --params '{"line":1,"column":1}'Before
import "core:fmt"
import "core:fmt"After
import "core:fmt"The duplicate declaration is removed and a single import "core:fmt" remains.
Add a package qualifier to a call
text.odin assigns result := contains(str, substr), calling contains without the strings package it comes from.
$ act refactor-lang add_package_qualifier --file text.odin --params '{"symbol":"contains","package":"strings","line":1,"column":1}'Before
result := contains(str, substr)After
result := strings.contains(str, substr)The call becomes strings.contains(str, substr), qualifying contains with the strings package it belongs to.
Rename a struct
settings.odin declares Config with host, port, and debug fields, then builds one with cfg := Config{"localhost", 8080, true}.
$ act refactor-lang rename_struct --file settings.odin --params '{"old_name":"Config","new_name":"Settings","line":1,"column":1}'Before
Config :: struct {
host: string,
port: int,
debug: bool,
}
cfg := Config{"localhost", 8080, true}After
Settings :: struct {
host: string,
port: int,
debug: bool,
}
cfg := Settings{"localhost", 8080, true}Config becomes Settings in both the struct declaration and the cfg := Settings{"localhost", 8080, true} literal; the field list and values are untouched.
Add a field to a struct
Person in process.odin declares only a name field.
$ act refactor-lang add_struct_field --file process.odin --params '{"struct_name":"Person","field_name":"age","field_type":"int","line":1,"column":1}'Before
Person :: struct {
name: string,
}After
Person :: struct {
name: string,
age: int,
}age: int, is appended inside the braces, matching the existing four-space indentation and trailing comma.
Rename a procedure and its call site
ops.odin declares calculate and calls it once, result := calculate(3, 4).
$ act refactor-lang rename_function --file ops.odin --params '{"old_name":"calculate","new_name":"multiply","line":1,"column":1}'Before
calculate :: proc(x: int, y: int) -> int {
return x * y
}
result := calculate(3, 4)After
multiply :: proc(x: int, y: int) -> int {
return x * y
}
result := multiply(3, 4)calculate becomes multiply in both the proc declaration and the call, result := multiply(3, 4).
Query the file's structure as a skeleton
entity.odin declares two structs, Entity and Vec2, and three procedures — spawn_entity, apply_gravity, and detect_collision — for a small game entity system.
$ act query skeleton entity.odinBefore
package game
Entity :: struct {
id: int,
position: Vec2,
velocity: Vec2,
health: int,
}
Vec2 :: struct {
x: f32,
y: f32,
}
spawn_entity :: proc(pos: Vec2) -> Entity {
return Entity{id = next_id(), position = pos, velocity = Vec2{0, 0}, health = 100}
}
apply_gravity :: proc(e: ^Entity, dt: f32) {
e.velocity.y -= GRAVITY * dt
}
detect_collision :: proc(a: Entity, b: Entity) -> bool {
return distance(a.position, b.position) < COLLISION_RADIUS
}Output
{
"type": "Skeleton",
"declarations": [
{
"kind": "module",
"name": "game",
"range": {
"start": {
"file": "entity.odin",
"line": 1,
"column": 1,
"byte_offset": 0
},
"end": {
"file": "entity.odin",
"line": 1,
"column": 13,
"byte_offset": 12
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 1,
"column": 9,
"byte_offset": 8
},
"end": {
"file": "entity.odin",
"line": 1,
"column": 13,
"byte_offset": 12
}
}
},
{
"kind": "struct",
"name": "Entity",
"range": {
"start": {
"file": "entity.odin",
"line": 3,
"column": 1,
"byte_offset": 14
},
"end": {
"file": "entity.odin",
"line": 8,
"column": 2,
"byte_offset": 104
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 3,
"column": 1,
"byte_offset": 14
},
"end": {
"file": "entity.odin",
"line": 3,
"column": 7,
"byte_offset": 20
}
}
},
{
"kind": "field",
"name": "id",
"range": {
"start": {
"file": "entity.odin",
"line": 4,
"column": 5,
"byte_offset": 37
},
"end": {
"file": "entity.odin",
"line": 4,
"column": 12,
"byte_offset": 44
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 4,
"column": 5,
"byte_offset": 37
},
"end": {
"file": "entity.odin",
"line": 4,
"column": 7,
"byte_offset": 39
}
}
},
{
"kind": "field",
"name": "position",
"range": {
"start": {
"file": "entity.odin",
"line": 5,
"column": 5,
"byte_offset": 50
},
"end": {
"file": "entity.odin",
"line": 5,
"column": 19,
"byte_offset": 64
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 5,
"column": 5,
"byte_offset": 50
},
"end": {
"file": "entity.odin",
"line": 5,
"column": 13,
"byte_offset": 58
}
}
},
{
"kind": "field",
"name": "velocity",
"range": {
"start": {
"file": "entity.odin",
"line": 6,
"column": 5,
"byte_offset": 70
},
"end": {
"file": "entity.odin",
"line": 6,
"column": 19,
"byte_offset": 84
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 6,
"column": 5,
"byte_offset": 70
},
"end": {
"file": "entity.odin",
"line": 6,
"column": 13,
"byte_offset": 78
}
}
},
{
"kind": "field",
"name": "health",
"range": {
"start": {
"file": "entity.odin",
"line": 7,
"column": 5,
"byte_offset": 90
},
"end": {
"file": "entity.odin",
"line": 7,
"column": 16,
"byte_offset": 101
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 7,
"column": 5,
"byte_offset": 90
},
"end": {
"file": "entity.odin",
"line": 7,
"column": 11,
"byte_offset": 96
}
}
},
{
"kind": "struct",
"name": "Vec2",
"range": {
"start": {
"file": "entity.odin",
"line": 10,
"column": 1,
"byte_offset": 106
},
"end": {
"file": "entity.odin",
"line": 13,
"column": 2,
"byte_offset": 148
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 10,
"column": 1,
"byte_offset": 106
},
"end": {
"file": "entity.odin",
"line": 10,
"column": 5,
"byte_offset": 110
}
}
},
{
"kind": "field",
"name": "x",
"range": {
"start": {
"file": "entity.odin",
"line": 11,
"column": 5,
"byte_offset": 127
},
"end": {
"file": "entity.odin",
"line": 11,
"column": 11,
"byte_offset": 133
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 11,
"column": 5,
"byte_offset": 127
},
"end": {
"file": "entity.odin",
"line": 11,
"column": 6,
"byte_offset": 128
}
}
},
{
"kind": "field",
"name": "y",
"range": {
"start": {
"file": "entity.odin",
"line": 12,
"column": 5,
"byte_offset": 139
},
"end": {
"file": "entity.odin",
"line": 12,
"column": 11,
"byte_offset": 145
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 12,
"column": 5,
"byte_offset": 139
},
"end": {
"file": "entity.odin",
"line": 12,
"column": 6,
"byte_offset": 140
}
}
},
{
"kind": "function",
"name": "spawn_entity",
"range": {
"start": {
"file": "entity.odin",
"line": 15,
"column": 1,
"byte_offset": 150
},
"end": {
"file": "entity.odin",
"line": 17,
"column": 2,
"byte_offset": 282
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 15,
"column": 1,
"byte_offset": 150
},
"end": {
"file": "entity.odin",
"line": 15,
"column": 13,
"byte_offset": 162
}
}
},
{
"kind": "function",
"name": "apply_gravity",
"range": {
"start": {
"file": "entity.odin",
"line": 19,
"column": 1,
"byte_offset": 284
},
"end": {
"file": "entity.odin",
"line": 21,
"column": 2,
"byte_offset": 363
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 19,
"column": 1,
"byte_offset": 284
},
"end": {
"file": "entity.odin",
"line": 19,
"column": 14,
"byte_offset": 297
}
}
},
{
"kind": "function",
"name": "detect_collision",
"range": {
"start": {
"file": "entity.odin",
"line": 23,
"column": 1,
"byte_offset": 365
},
"end": {
"file": "entity.odin",
"line": 25,
"column": 2,
"byte_offset": 486
}
},
"name_range": {
"start": {
"file": "entity.odin",
"line": 23,
"column": 1,
"byte_offset": 365
},
"end": {
"file": "entity.odin",
"line": 23,
"column": 17,
"byte_offset": 381
}
}
}
]
}The output lists Entity and Vec2 as struct declarations with their fields, and spawn_entity, apply_gravity, and detect_collision as function declarations, each with its own name range separate from its full range.
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-function-parameter |
Add a parameter to a function definition |
add-import |
Add import statement for a package at top of file |
add-null-check |
Wrap statement with null check guard |
add-package-qualifier |
Add package prefix to unqualified function calls |
add-struct-field |
Add a new field to a struct definition |
convert-for-to-while |
Convert for loop to while loop with index counter |
convert-if-to-switch |
Convert chained if statements to switch statement |
convert-pointer-to-value |
Convert pointer type to value type |
convert-struct-to-named-type |
Convert anonymous struct to named type definition |
convert-switch-to-if |
Convert simple switch statement to if statement chain |
convert-value-to-pointer |
Convert value type to pointer type |
convert-while-to-for |
Convert while loop with index to for loop |
extract-function |
Extract code block into new named function |
extract-variable |
Extract expression into named 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-equality-check |
Generate equality check function for a struct |
generate-error-check |
Generate error checking procedure for a function |
generate-function-stub |
Generate empty function with signature |
generate-string-builder-impl |
Generate string building utilities for a type |
generate-test-procedure |
Generate test procedure for a given function |
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 |
Replace function call with function body |
inline-variable |
Replace variable reference with assigned value |
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-expression |
Swap condition and branches of an if statement |
merge-imports |
Merge multiple import statements for the same package |
move-function-to-file |
Move function definition from current file to target file |
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-function-parameter |
Remove a parameter from a function definition |
remove-package-qualifier |
Remove package prefix from qualified function calls |
remove-struct-field |
Remove a field from a struct definition |
remove-unused-import |
Remove import statement if package is not referenced |
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 update all call sites |
rename-struct |
Rename a struct and update all usages |
rename-variable |
Rename a variable across all references in the same scope |
simplify-if-expression |
Simplify if expression that returns boolean values |
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