ast-index

name	ast-index
description	This skill should be used when the user asks to "find a class", "search for symbol", "find usages", "find implementations", "search codebase", "find file", "class hierarchy", "find callers", "module dependencies", "unused dependencies", "project map", "project conventions", "project structure", "what frameworks", "what architecture", "find Perl subs", "Perl exports", "find Python class", "Go struct", "Go interface", "find React component", "find TypeScript interface", "find Rust struct", "find Ruby class", "find C# controller", "find Dart class", "find Flutter widget", "find mixin", "find Scala trait", "find case class", "find object", "find PHP class", "find Laravel model", "find PHP trait", or needs fast code search in Android/Kotlin/Java, iOS/Swift/ObjC, Dart/Flutter, TypeScript/JavaScript, Rust, Ruby, C#, Scala, PHP, Perl, Python, Go, C++, or Protocol Buffers projects. Also triggered by mentions of "ast-index" CLI tool.
user-invocable	false

ast-index - Code Search for Multi-Platform Projects

Fast native Rust CLI for structural code search in Android/Kotlin/Java, iOS/Swift/ObjC, Dart/Flutter, TypeScript/JavaScript, Rust, Ruby, C#, Scala, PHP, Perl, Python, Go, C++, and Proto projects using SQLite + FTS5 index.

Critical Rules

ALWAYS use ast-index FIRST for any code search task. These rules are mandatory:

1. ast-index is the PRIMARY search tool — use it before grep, ripgrep, or Search tool
2. DO NOT duplicate results — if ast-index found usages/implementations, that IS the complete answer
3. DO NOT run grep "for completeness" after ast-index returns results
4. Use grep/Search ONLY when:
   • ast-index returns empty results
   • Searching for regex patterns (ast-index uses literal match)
   • Searching for string literals inside code ("some text")
   • Searching in comments content

Why: ast-index is 17-69x faster than grep (1-10ms vs 200ms-3s) and returns structured, accurate results.

Prerequisites

Install the CLI before use:

brew tap defendend/ast-index
brew install ast-index

Initialize index in project root:

cd /path/to/project
ast-index rebuild

The index is stored at ~/Library/Caches/ast-index/<project-hash>/index.db (macOS) or ~/.cache/ast-index/<project-hash>/index.db (Linux). Rebuild deletes the DB file entirely and creates a fresh index.

Supported Projects

Platform	Languages	Module System
Android/Java	Kotlin, Java	Gradle (build.gradle.kts), Maven (pom.xml)
iOS	Swift, Objective-C	SPM (Package.swift)
Web	TypeScript, JavaScript, React, Vue, Svelte	package.json
Rust	Rust	Cargo.toml
Ruby	Ruby, Rails, RSpec	Gemfile
.NET	C#, ASP.NET, Unity	*.csproj
Dart/Flutter	Dart	pubspec.yaml
Scala	Scala	Bazel (WORKSPACE, BUILD)
PHP	PHP	composer.json
Perl	Perl	Makefile.PL, Build.PL
Python	Python	None (*.py files)
Go	Go	None (*.go files)
Proto	Protocol Buffers (proto2/proto3)	None (*.proto files)
WSDL	WSDL, XSD	None (*.wsdl, *.xsd files)
C/C++	C, C++ (JNI, uservices)	None (*.cpp, *.h, *.hpp files)
Godot	GDScript	project.godot
Mixed	All above	All

Project type is auto-detected by marker files (build.gradle.kts, Package.swift, Makefile.PL, etc.). Python, Go, Proto, WSDL, and C++ files are indexed alongside main project type.

Core Commands

Explore (one-shot context)

explore - Rank the symbols most relevant to a query, print their source (read fresh from disk), list graph neighbours (callers/subclasses), and locate tests by path convention — in a single call. Prefer this over a search + read loop when you want to understand an area. Language-agnostic and vendor-aware (node_modules .d.ts and cross-stack matches are down-ranked, never deleted).

ast-index explore applicant merge MergeService   # bag of symbol/file names
ast-index explore "how does auth session work"   # natural-language question
ast-index explore PaymentService --rwr           # --rwr: re-rank via call/inheritance graph
ast-index explore Repository --max-files 8        # cap source files shown (default 6)
ast-index explore Session request --rwr --format json

• Default (Stage A) ranks by lexical match + multi-term corroboration.
• --rwr (Stage B) builds a call/inheritance graph in memory and re-ranks by personalized PageRank, surfacing callers/subclasses in a "Graph neighbours" section. Slightly slower; best when you care about who-calls-what.

Universal Search

search - Perform universal search across files, symbols, and modules simultaneously.

ast-index search "Payment"           # Finds files, classes, functions matching "Payment"
ast-index search "ViewModel"         # Returns files, symbols, modules in ranked order
ast-index search "Store" --fuzzy     # Fuzzy: exact → prefix → contains matching
ast-index search "Handler" --module "core/"  # Search within a module
ast-index search "UserService"       # Find Java/Spring services
ast-index search "@RestController"   # Find Spring REST controllers (annotation search)
ast-index search "@GetMapping"       # Find GET endpoint mappings

File Search

file - Find files by name pattern.

ast-index file "Fragment.kt"         # Find files ending with Fragment.kt
ast-index file "ViewController"      # Find iOS view controllers

Symbol Search

symbol - Find symbols (classes, interfaces, functions, properties) by name.

ast-index symbol "PaymentInteractor" # Find exact symbol
ast-index symbol "Presenter"         # Find all presenters
ast-index symbol "Store" --fuzzy     # Fuzzy: exact → prefix → contains matching
ast-index symbol "Mapper" --in-file "payments/" --limit 10  # Scoped search
ast-index symbol "@Service"          # Find all @Service annotations

Class Search

class - Find class, interface, or protocol definitions.

ast-index class "BaseFragment"       # Find Android base fragment
ast-index class "UIViewController"   # Find iOS view controller subclass
ast-index class "Store" --fuzzy      # Find all classes containing "Store"
ast-index class "Repository" --module "features/payments"  # Filter by module
ast-index class "UserController"     # Find Java/Spring controller class

Usage Search

usages - Find all places where a symbol is used. Critical for refactoring.

ast-index usages "PaymentRepository" # Find all usages of repository
ast-index usages "onClick"           # Find all click handler usages
ast-index usages "fetchData" --in-file "src/api/"  # Scoped to file path
ast-index usages "Repository" --module "features/auth" --limit 100

Performance: ~8ms for indexed symbols.

Cross-References

refs - Show cross-references for a symbol: definitions, imports, and usages in one view.

ast-index refs "PaymentRepository"   # Definitions + imports + usages
ast-index refs "BaseFragment" --limit 10  # Limit results per section

Implementation Search

implementations - Find all classes that extend or implement a given class/interface/protocol. Supports partial name matching with relevance ranking (exact → suffix → contains).

ast-index implementations "BasePresenter"  # Find all presenter implementations
ast-index implementations "Repository"     # Find repository implementations (exact match)
ast-index implementations "Service"        # Partial: finds UserService, PaymentService impls too
ast-index implementations "ViewModel" --module "features/"  # Scoped to module

Class Hierarchy

hierarchy - Display complete class hierarchy tree.

ast-index hierarchy "BaseFragment"   # Show fragment inheritance tree

Caller Search

callers - Find all places that call a specific function.

ast-index callers "onClick"          # Find all onClick calls
ast-index callers "fetchUser"        # Find API call sites

Call Tree

call-tree - Show complete call hierarchy going UP (who calls the callers). Supports Kotlin, Java, Swift, Perl, ObjC.

ast-index call-tree "processPayment" --depth 3 --limit 10
ast-index call-tree "getUsers"       # Java: finds callers of getUsers() method

File Analysis

imports - List all imports in a specific file.

ast-index imports "path/to/File.kt"  # Show Kotlin file imports

outline - Show all symbols defined in a file. Uses tree-sitter for accurate parsing of all supported languages.

ast-index outline "PaymentFragment.kt"    # Show Kotlin fragment structure
ast-index outline "UserController.java"   # Show Java controller methods
ast-index outline "App.tsx"               # Show TypeScript/React components and functions
ast-index outline "handler.rs"            # Show Rust structs, impls, functions

Code Quality

todo - Find TODO/FIXME/HACK comments in code.

ast-index todo                           # Find all TODO comments
ast-index todo --limit 10                # Limit results

deprecated - Find @Deprecated annotations.

ast-index deprecated                     # Find deprecated items

unused-symbols - Find potentially unused exported symbols.

ast-index unused-symbols --module path/to/module   # In specific module
ast-index unused-symbols --export-only             # Only exported (public) symbols

Git/Arc Integration

changed - Show symbols changed in git/arc diff. Auto-detects VCS and base branch.

ast-index changed                        # Auto: trunk (arc) or origin/main (git)
ast-index changed --base main            # Explicit base branch
ast-index changed --base trunk           # For arc projects

Public API

api - Show public API of a module. Accepts module path or module name (dots converted to slashes).

ast-index api "path/to/module"           # By path
ast-index api "module.name"              # By module name (dots → slashes)

Project Insights

Project Map

map - Show compact project overview: top directories by size with symbol kind counts. Use --module to drill down into a specific area with full class/inheritance details.

ast-index map                                # Summary: top 50 dirs with kind counts (~54 lines)
ast-index map --limit 20                     # Show only top 20 directories
ast-index map --module features/payments     # Detailed: classes with inheritance for a module
ast-index map --module src/core --per-dir 10 # More symbols per directory in detailed mode
ast-index map --format json                  # JSON output

Summary mode output (default, no --module):

Project: Android (Kotlin/Java) | 29144 files | 859 modules | top 50 of 728 dirs

  features/taxi_order/impl/          1626 files | 371 iface, 94 obj, 1834 cls
  features/masstransit/impl/          862 files | 165 obj, 1261 cls, 280 iface

Detailed mode output (with --module):

features/payments/impl/ (250 files)
  PaymentInteractor : class > BaseInteractor
  PaymentRepository : interface
  PaymentMapper : class

Project Conventions

conventions - Auto-detect architecture patterns, frameworks, and naming conventions from the indexed codebase. Runs read-only SQL queries — no file scanning needed.

ast-index conventions                        # Text output (~30 lines)
ast-index conventions --format json          # JSON output

Detects:

• Architecture: Clean Architecture, Feature-sliced, BLoC, MVC, MVVM, MVP, Redux, Composition API, Hooks
• Frameworks: DI (Hilt, Dagger, Koin), Async (Coroutines, RxJava, Combine), Network (Retrofit, OkHttp), DB (Room, Realm), UI (Compose, SwiftUI, React, Flutter), Testing (JUnit, Kotest, XCTest, pytest, Jest)
• Naming patterns: ViewModel, Repository, UseCase, Service, Controller, Fragment, etc. (with counts)

Common Flags

Most search commands (search, symbol, class, usages, implementations) support:

Flag	Description
--fuzzy	Fuzzy search: exact match → prefix match → contains match
--in-file <PATH>	Filter results by file path (substring match)
--module <PATH>	Filter results by module path (substring match)
--limit <N>	Max results to return
--format json	JSON output for structured processing

When to use --fuzzy: When you don't know the exact name. ast-index class "Store" --fuzzy finds Store, StoreImpl, AppStore, DataStoreRepository, etc. The --fuzzy flag performs three-stage matching: exact match first, then prefix match, then contains match.

Index Management

ast-index rebuild                        # Full rebuild with dependencies
ast-index rebuild --no-deps              # Skip module dependency indexing
ast-index rebuild --no-ignore            # Include gitignored files (build/, etc.)
ast-index rebuild --sub-projects         # Index each sub-project separately (large monorepos)
ast-index rebuild -j 32                  # Use 32 threads (for network/FUSE filesystems)
ast-index rebuild -v                     # Verbose logging with timing per step
ast-index update                         # Incremental update (changed files only)
ast-index stats                          # Show index statistics
ast-index clear                          # Delete index for current project
ast-index restore /path/to/index.db      # Restore index from a .db file
ast-index watch                          # Watch for file changes and auto-update index

Directory-Scoped Search

When running search from a subdirectory, results are automatically limited to that subtree (the index DB in cache is used to detect the project root):

cd /project/root
ast-index rebuild                        # Index entire project, creates .ast-index-root
ast-index search "Payment"              # Finds results across entire project

cd /project/root/services/payments
ast-index search "Payment"              # Only finds results within services/payments/
ast-index class "PaymentService"        # Only classes in services/payments/ subtree

This works with all search commands: search, symbol, class, implementations, usages.

Multi-Root Projects

Add additional source roots for monorepos or multi-project setups. Extra roots are indexed alongside the primary project and their module dependencies are included.

ast-index add-root /path/to/other/source    # Add source root (warns on overlap)
ast-index add-root ./subdir --force         # Force add even if inside project root
ast-index remove-root /path/to/other/source # Remove source root
ast-index list-roots                        # List configured roots

Utility Commands

ast-index version                    # Show CLI version
ast-index help                       # Show help message
ast-index help <command>             # Show help for specific command
ast-index install-claude-plugin      # Install Claude Code plugin to ~/.claude/plugins/

Programmatic Access (SQL & SDK)

For complex analysis that requires combining multiple queries, filtering, or aggregation — use direct SQL access instead of chaining multiple commands.

Structural Search (ast-grep)

Structural code search using AST patterns. Requires sg (ast-grep) installed.

# Simple pattern matching
ast-index agrep "router.launch($$$)" --lang kotlin
ast-index agrep "@Inject constructor($$$)" --lang kotlin
ast-index agrep "suspend fun $NAME($$$)" --lang kotlin

# Find classes extending a specific base
ast-index agrep "class $NAME : BasePresenter($$$)" --lang kotlin

# Find async functions (Swift)
ast-index agrep "func $NAME($$$) async" --lang swift

# Find React components
ast-index agrep "export default function $NAME($$$)" --lang typescript

# JSON output for programmatic use
ast-index agrep "@Composable fun $NAME($$$)" --lang kotlin --json

Pattern syntax (ast-grep):

• $NAME — matches a single AST node (captures as metavariable)
• $$$ — matches zero or more AST nodes (variadic)
• Everything else is literal pattern matching against the AST

When to use agrep vs built-in commands:

• composables, inject, suspend → use built-in (faster, pre-configured)
• Custom structural patterns, negative matching, context queries → use agrep

Raw SQL Query

# Execute any SELECT query against the index database (JSON output)
ast-index query "SELECT s.name, s.kind, f.path FROM symbols s JOIN files f ON s.file_id = f.id WHERE s.kind = 'class'"

# With limit
ast-index query "SELECT * FROM symbols WHERE name LIKE '%Service%'" --limit 50

# Complex joins — find classes that implement an interface but have no usages
ast-index query "SELECT s.name, f.path FROM symbols s JOIN files f ON s.file_id = f.id JOIN inheritance i ON s.id = i.child_id WHERE i.parent_name = 'Repository' AND s.name NOT IN (SELECT name FROM refs)"

# Find files with most symbols (complexity hotspots)
ast-index query "SELECT f.path, COUNT(*) as sym_count FROM symbols s JOIN files f ON s.file_id = f.id GROUP BY f.id ORDER BY sym_count DESC LIMIT 20"

# Find unused classes (defined but never referenced)
ast-index query "SELECT s.name, s.kind, f.path FROM symbols s JOIN files f ON s.file_id = f.id WHERE s.kind IN ('class', 'interface') AND s.name NOT IN (SELECT name FROM refs) AND s.name NOT IN (SELECT parent_name FROM inheritance)"

# Module dependency analysis — find modules with most dependencies
ast-index query "SELECT m.name, COUNT(*) as dep_count FROM module_deps md JOIN modules m ON md.module_id = m.id GROUP BY m.id ORDER BY dep_count DESC"

# CTE — transitive dependency chain
ast-index query "WITH RECURSIVE chain AS (SELECT md.dep_module_id, m.name, 1 as depth FROM module_deps md JOIN modules m ON md.dep_module_id = m.id WHERE md.module_id = (SELECT id FROM modules WHERE name LIKE '%payments%') UNION ALL SELECT md.dep_module_id, m.name, c.depth + 1 FROM chain c JOIN module_deps md ON md.module_id = c.dep_module_id JOIN modules m ON md.dep_module_id = m.id WHERE c.depth < 5) SELECT DISTINCT name, depth FROM chain ORDER BY depth, name"

Security: Only SELECT, WITH, and EXPLAIN queries allowed. Mutations (INSERT, UPDATE, DELETE, DROP) are blocked.

Database Schema

# Show all tables with columns and row counts (JSON)
ast-index schema

Key tables:

Table	Description	Key columns
files	Indexed source files	path, mtime, size
symbols	Classes, functions, properties, etc.	name, kind, line, file_id, signature
symbols_fts	FTS5 full-text search on symbols	name, signature
inheritance	Parent-child type relationships	child_id, parent_name, kind
refs	Symbol references/usages	name, line, file_id, context
modules	Build modules (Gradle, Maven, etc.)	name, path, kind
module_deps	Module → module dependencies	module_id, dep_module_id
transitive_deps	Pre-computed transitive deps	module_id, dependency_id, depth
xml_usages	Android XML layout class usages	class_name, file_path
resources	Android resource definitions	type, name, file_path

Direct Database Access (SDK / Scripting)

# Get the SQLite database path for external tools
ast-index db-path
# Output: /Users/me/.cache/ast-index/abc123/index.db

Use this path with any language that supports SQLite:

import sqlite3, json
db_path = subprocess.check_output(["ast-index", "db-path"]).decode().strip()
conn = sqlite3.connect(db_path)

# Example: find all classes implementing an interface with no references
unused_impls = conn.execute("""
    SELECT s.name, f.path, i.parent_name
    FROM symbols s
    JOIN files f ON s.file_id = f.id
    JOIN inheritance i ON s.id = i.child_id
    WHERE s.name NOT IN (SELECT name FROM refs)
    ORDER BY i.parent_name, s.name
""").fetchall()
for name, path, parent in unused_impls:
    print(f"  {name} implements {parent} — {path}")

When to use query vs predefined commands:

• Simple lookups → use search, class, usages (faster, formatted output)
• Complex joins, aggregation, negative conditions → use query (one call instead of N)
• Batch analysis, scripting, CI pipelines → use db-path + direct SQLite access

Performance Reference

Command	Time	Notes
search	~10ms	Indexed FTS5 search
class	~1ms	Direct index lookup
usages	~8ms	Indexed reference search
imports	~0.3ms	File-based lookup
callers	~1s	Grep-based search
map	~1-3s	SQL aggregation (scales with project size)
conventions	~1-4s	SQL aggregation + import matching
rebuild	~25s–5m	Full project indexing (depends on size)

Platform-Specific Commands

Android/Kotlin/Java/Spring

Consult: references/android-commands.md

Java parser indexes: classes, interfaces, enums, methods, constructors, fields, and significant annotations (@RestController, @Service, @Repository, @Component, @Entity, @GetMapping, @PostMapping, @Autowired, @Override, @Transactional, @SpringBootApplication, @Test, @Inject, @Data, @Builder, etc.).

Maven modules (pom.xml) are fully supported alongside Gradle modules.

• DI Commands: provides, inject (@Inject + @Autowired), annotations
• Compose Commands: composables, previews
• Coroutines Commands: suspend, flows
• XML Commands: xml-usages, resource-usages
• Code Quality: deprecated, suppress, todo
• Extensions: extensions
• Navigation: deeplinks

iOS/Swift/ObjC

Consult: references/ios-commands.md

• Storyboard & XIB: storyboard-usages
• Assets: asset-usages
• SwiftUI: swiftui
• Swift Concurrency: async-funcs, main-actor
• Combine: publishers

TypeScript/JavaScript

Consult: references/typescript-commands.md

• Index: class, interface, type, function, const, decorators
• Supports: React (hooks, components), Vue SFC, Svelte, NestJS, Angular
• outline and imports work with TS/JS files

Rust

Consult: references/rust-commands.md

• Index: struct, enum, trait, impl, fn, macro_rules!, mod
• Supports: Derives, attributes (#[test], #[derive])
• outline and imports work with Rust files

Ruby

Consult: references/ruby-commands.md

• Index: class, module, def, Rails DSL
• Supports: RSpec (describe, it, let), Rails (associations, validations)
• outline and imports work with Ruby files

C#/.NET

Consult: references/csharp-commands.md

• Index: class, interface, struct, record, enum, methods, properties
• Supports: ASP.NET attributes, Unity (MonoBehaviour, SerializeField)
• outline and imports work with C# files

Dart/Flutter

Consult: references/dart-commands.md

• Index: class, mixin, extension, extension type, enum, typedef, functions, constructors
• Supports: Dart 3 modifiers (sealed, final, base, interface, mixin class)
• outline and imports work with Dart files

Python

Consult: references/python-commands.md

• Index: class, def, async def, decorators
• outline and imports work with Python files

Go

Consult: references/go-commands.md

• Index: package, type struct, type interface, func
• outline and imports work with Go files

Scala

• Index: class, case class, object, trait, enum (Scala 3), def, val, var, type, given
• Supports: Inheritance (extends/with), companion objects
• outline and imports work with Scala files

PHP

• Index: namespace, class, interface, trait, enum, function, method, const, property, use
• Supports: Laravel (models, traits, facades), extends/implements, namespace imports
• outline and imports work with PHP files

Perl

Consult: references/perl-commands.md

• Exports: perl-exports
• Subroutines: perl-subs
• POD: perl-pod
• Imports: perl-imports
• Tests: perl-tests

Module Analysis

Consult: references/module-commands.md

• Module Search: module
• Dependencies: deps, dependents
• Unused Dependencies: unused-deps
• Unused Symbols: unused-symbols
• Public API: api

Workflow Recommendations

1. Run ast-index rebuild once in project root to build the index
2. Start a session with ast-index conventions + ast-index map to understand project structure (~80 lines, ~500 tokens)
3. Use ast-index map --module <path> to drill down into specific areas
4. Use ast-index search for quick universal search when exploring
5. Use ast-index class for precise class/interface lookup
6. Use ast-index usages to find all references before refactoring
7. Use ast-index implementations to understand inheritance
8. Use ast-index changed --base main before code review
9. Run ast-index update periodically to keep index fresh

JSON Output (Optional)

Default output is human-readable plain text — use it unless you specifically need structured data for scripting.

Add --format json only when:

• Parsing output programmatically (pipelines, scripts)
• Need exact field values (file paths, line numbers, symbol kinds)
• Integrating with another tool

Supported commands: search, symbol, class, usages, implementations, refs, stats, unused-symbols, map, conventions.

ast-index search "Query" --format json | jq '.results[].path'

Additional Resources

For detailed platform-specific commands, consult:

• references/android-commands.md - DI, Compose, Coroutines, XML
• references/ios-commands.md - Storyboard, SwiftUI, Combine
• references/typescript-commands.md - React, Vue, Svelte, NestJS, Angular
• references/rust-commands.md - Structs, traits, impl blocks, macros
• references/ruby-commands.md - Rails, RSpec, classes, modules
• references/csharp-commands.md - ASP.NET, Unity, controllers, interfaces
• references/dart-commands.md - Dart/Flutter classes, mixins, extensions
• references/perl-commands.md - Perl exports, subs, POD
• references/python-commands.md - Python classes, functions
• references/go-commands.md - Go structs, interfaces
• references/cpp-commands.md - C/C++ classes, JNI functions
• references/proto-commands.md - Protocol Buffers messages, services
• references/wsdl-commands.md - WSDL services, XSD types
• references/module-commands.md - Module dependencies