wyolet-symbol 0.2.1

AST-native code intelligence for Python — MCP server for Claude Code (12 agent tools) + standalone audit CLI (dead code, import graph, swallowed exceptions, 500+ language LOC via Linguist port).

symbol

AST-native code intelligence for Python. A CLI for humans, an MCP server for agents.

Point symbol at a directory and ask it questions a human or a coding agent actually has:

• What frameworks does this project use, where are the entry points, which files are dead, what runs on import, where the TODOs and swallowed exceptions hide?
• Where is UserService defined, who calls db.commit, what's the body of process_payment — without re-reading 800 lines of file?

Static analysis only — symbol never imports or executes the target code.

Status: wyolet-symbol on PyPI (CLI command is symbol — the bare name is reserved by PyPI policy). Python is the proving ground; Go and TypeScript are next on the roadmap.

Install

CLI only

uv tool install wyolet-symbol      # or: pipx install wyolet-symbol

Then symbol audit /path/to/project, symbol loc, symbol map work from any directory.

Claude Code plugin (CLI + MCP server + skill + hooks)

For full agent integration — MCP tools (SearchSymbol, SymbolBody, MultiPatch, …), the symbol skill, and soft-nudge PreToolUse / PostToolUse hooks that steer Claude away from native Grep/Read/Edit on indexed Python files:

# 1. Install the CLI from PyPI
uv tool install wyolet-symbol

# 2. Install the plugin in Claude Code (bundles MCP server registration, skill, hooks)
claude plugin install git+https://github.com/wyolet/symbol@main

Other agent coding tools

The MCP server is plain stdio MCP — it works anywhere MCP works. opencode setup is documented in docs/integrations/opencode.md. Cursor, Continue, and Zed integrations are tracked in #8; help wanted. The Claude-Code-specific glue (skill + hooks) does not port automatically.

Updating / uninstall

uv tool upgrade wyolet-symbol      # or: uv tool uninstall wyolet-symbol
claude plugin update symbol        # or: claude plugin uninstall symbol

Commands

symbol audit <path> — Full codebase audit

Runs all registered checkers: stack detection, entry points, orphan files, side effects, swallowed exceptions, TODOs, unused deps, code structure metrics.

symbol audit /path/to/project
symbol -v audit /path/to/project   # verbose — full detail
symbol /path/to/project            # shortcut — defaults to audit

symbol loc <path> — Lines of code

GitHub Linguist port: 500+ languages, real GitHub colors, multi-strategy detection (modeline, shebang, filename, extension, XML, manpage). Colored bar chart by default.

symbol loc /path/to/project

symbol map <path> — Import graph analysis

Circular imports, hotspots, fragile modules, deep chains, leaf modules, blast radius.

symbol map /path/to/project
symbol map /path/to/project --blast src/models.py      # blast radius
symbol map /path/to/project --min-chain 3              # show shorter chains
symbol map /path/to/project --min-fan-in 3             # lower hotspot threshold

Symbol-level inspection

symbol search UserService              # exact / suffix match on qualified path
symbol search user service --fixed     # all patterns must appear as substrings
symbol search '^get_' --regex          # Python regex
symbol search save --kind method

symbol code services.user.UserService         # body by qualified path
symbol code services.user.UserService.save    # method
symbol code src/services/user.py:120-145      # by explicit line range

symbol outline src/services/user.py    # parent-child tree of one file
symbol callers UserService             # textual tier-1 reference scan

symbol patch <file> — Byte-range edit

Edit by line range without sending an old_string payload. Replace (with content), delete (empty content), or insert (zero-width range).

symbol patch src/foo.py --range 10-20 --content 'new body'    # replace
symbol patch src/foo.py --range 10-20 --content ''            # delete
symbol patch src/foo.py --range 10-10 --content 'import os'   # insert before line 10

symbol patch src/foo.py --range 10-20 --content '...' --dry-run   # preview diff
symbol patch src/foo.py --range 10-20 --content '...' --force     # skip read-cache check
symbol patch src/foo.py --range 10-20 --content '...' --agent     # plain text for LLMs

Exit codes: 0 applied/dry-run, 1 error, 2 needs_read_confirmation.

Plus

symbol analyze <file>, symbol dump <path>, symbol init <path>, symbol update-linguist, symbol undo, symbol refresh [--full].

MCP surface (12 agent tools)

When run as symbol mcp (or installed via the plugin), symbol exposes:

Read	Write	Safety
SearchSymbol	Patch	Undo
SymbolBody	MultiPatch	Refresh
SymbolOutline	InsertSymbol
SymbolCallers	DeleteSymbol
	RenameSymbol
	ReplaceSymbol

Undo is transactional and operates on .symbol/transactions/ — no git involvement, no staged changes touched. Refresh is the escape hatch when the index drifts.

Configuration

Use symbol.toml at the project root, or add the same tables under [tool.symbol] in pyproject.toml.

# symbol.toml
[checker]
exclude = ["alembic/*", "scripts/*"]

[checkers.orphans]
severity = "warning"        # default: error
ignore = ["alembic/*", "src/main.py"]

[checkers.side_effects]
severity = "info"           # default: warning
ignore = ["*.include_router()", "*.add_middleware()"]

[checkers.unused_deps]
severity = "error"          # default: error
ignore = ["greenlet", "psycopg"]

In pyproject.toml, prefix those tables with tool.symbol:

[tool.symbol.checker]
exclude = ["alembic/*", "scripts/*"]

[tool.symbol.checkers.orphans]
severity = "warning"
ignore = ["alembic/*", "src/main.py"]

The config schema lives at schemas/symbol.config.schema.json. With Taplo, you can wire it up for both forms:

[[rule]]
include = ["symbol.toml"]
schema = { path = "schemas/symbol.config.schema.json" }

[[rule]]
include = ["pyproject.toml"]
keys = ["tool", "symbol"]
schema = { path = "schemas/symbol.config.schema.json" }

See docs/spec-schema.md for the package/spec schema.

Global options

-v, --verbose          Show full detail instead of compact output
--format json          Output as JSON (for CI/CD pipelines)
-i, --include PATTERN  Only analyze files matching glob pattern
-e, --exclude PATTERN  Skip files matching glob pattern

Why

Most Python tools find problems inside files (lint, types, dead code). symbol finds problems between files — and exposes the result to agents in tokens, not line ranges:

• knip does this for JavaScript/TypeScript. Python didn't have an equivalent. symbol fills that gap.
• GitHub Linguist ported to Python — accurate detection for 500+ languages with real GitHub colors.
• scc-style LOC with language breakdown and colored bar chart.
• Import-graph analysis — circular imports, hotspots, blast radius. Things no other Python tool surfaces.
• Agent-friendly write surface — symbol-level patch / rename / replace with byte-range edits and a transactional undo log, so coding agents don't have to re-read entire files to make safe changes.

First thing you run on an unfamiliar codebase, before reading a single line of code.

Architecture

src/wyolet/symbol/
├── cli.py                  Typer root CLI
├── commands/               Thin command views (audit, loc, map, analyze,
│                           search, code, outline, callers, patch, refresh,
│                           undo, init, + symbol-level ops for MCP)
├── checkers/               @register'd checkers
│   ├── stack.py            tech stack from deps
│   ├── entrypoints.py      __main__ guards, framework hooks
│   ├── orphans.py          unreachable files
│   ├── side_effects.py     bare module-level calls
│   ├── swallowed.py        silenced exceptions
│   ├── todos.py            TODO/FIXME/HACK/XXX
│   ├── unused_deps.py      declared but unimported
│   └── code_structure.py   functions, classes, type coverage
├── shared/                 Core infrastructure
│   ├── context.py          AnalysisContext (root, spec, cache, config)
│   ├── ast_cache.py        parse once, share across checkers
│   ├── registry.py         @register + views()
│   ├── runner.py           dispatches file/project checkers
│   ├── spec.py             spec loader
│   ├── config_resolver.py  spec → packages → project-config layering
│   ├── framework_detector.py
│   ├── pipeline.py         @hook(pipeline, priority)
│   ├── graph.py            import graph primitives
│   ├── symbol_index.py     qualified-path index for MCP read/write tools
│   └── linguist/           GitHub Linguist port (500+ langs)
└── data/
    ├── spec.toml           Global baseline spec
    └── specs/NAME/         Per-package specs (237 packages: django, fastapi,
                            celery, sqlalchemy, langchain, pydantic, ...)

Contributing

The fastest ways to help:

• Add a package spec for a library we don't cover yet — no Python required, just TOML. See #3 and CONTRIBUTING.md.
• Run symbol on your real Python project and file false positives. See #6.
• Benchmark the MCP surface against native Read/Grep/Edit on representative agent tasks. See #7.
• Wire symbol mcp into opencode / Cursor / Continue / Zed. See #8.

Pinned issues on the repo show what's most useful right now.

License

MIT