Python Lsp

What it does

When your agent uses it

• You need to follow an import to a definition
• Find all real uses of a symbol (excluding same-named-but-unrelated ones)
• Get an inferred type
• Surface type errors

Example prompts

• “go to definition”
• “find references”
• “what type is”
• “/python-lsp”

Requirements

• Python 3
• Node.js
• A Bash shell

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Wait for indexing before querying. Querying mid-index returns empty
2. 2Don't advertise workspace.configuration or workspace.workspaceFolders.
3. 3Reap the subprocess. Use the context manager (or call stop()) so
4. 4Open the files you query. Queries auto-did_open their target file, but
5. 5Root at the project, not the sub-package. pyright resolves absolute

What it can do on your machine

Read from SKILL.md and the folder at commit 559a6cd. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships 2 files in scripts/ (Python and Shell), which the agent can run.

  Shell commands in SKILL.md call:

  • python3
  • uv
  • sh

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use uv, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Python Lsp loads about 1.9k tokens when it runs. Until then it costs about 176 tokens; SKILL.md has 671 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~176

When it runs · the whole SKILL.md, loaded when a task matches

~1.9k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from oaustegard/claude-skills at commit 559a6cd, republished under its MIT licence (© oaustegard). 671 words, ~1,926 tokens.

name

python-lsp

description

Semantic Python code queries via a stdio LSP client driving pyright-langserver. Provides binding-resolved go-to-definition, find-references, hover types, type diagnostics, file symbol outlines, and project-wide symbol search — name resolution and type inference that tree-sitter and ripgrep cannot do. Use when you need to follow an import to a definition, find all real uses of a symbol (excluding same-named-but-unrelated ones), get an inferred type, surface type errors, outline a file, or search symbols across a project. Triggers on "go to definition", "find references", "what type is", "resolve this symbol", "symbol outline", "find symbol in project", "pyright", "type-check this file".

metadata.version

0.3.0

sh /mnt/skills/user/python-lsp/scripts/bootstrap.sh
# or, equivalently, the one-liner it wraps:
command -v pyright-langserver >/dev/null || uv tool install pyright

LSP=/mnt/skills/user/python-lsp/scripts/lsp_client.py

python3 $LSP bootstrap                              # ensure pyright installed
python3 $LSP <root> definition  <file> <line> <col>
python3 $LSP <root> references  <file> <line> <col>
python3 $LSP <root> hover       <file> <line> <col>
python3 $LSP <root> diagnostics <file>
python3 $LSP <root> symbols     <file>             # documentSymbol outline
python3 $LSP <root> wsymbols    <query>            # workspace/symbol search

import sys; sys.path.insert(0, "/mnt/skills/user/python-lsp/scripts")
from lsp_client import LSPClient

with LSPClient("/path/to/repo") as c:        # context manager reaps the subprocess
    c.open_all("pkg/service.py", "pkg/models.py")
    c.wait_for_index()                       # REQUIRED before querying — see below
    defs  = c.definition("pkg/service.py", 4, 8)   # -> [Location], follows imports
    refs  = c.references("pkg/models.py", 8, 4)     # -> [Location], binding-resolved
    typ   = c.hover("pkg/service.py", 4, 4)         # -> "(variable) u: User"
    diags = c.diagnostics("pkg/bad.py")             # -> [diagnostic dicts]
    outln = c.document_symbols("pkg/models.py")     # -> [SymbolInfo], file outline
    hits  = c.workspace_symbols("User")             # -> [SymbolInfo], project-wide

cd /mnt/skills/user/python-lsp
python3 -m pytest tests/test_lsp_client.py -v

© oaustegard, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 9 other files (scripts) in python-lsp of oaustegard/claude-skills.

• SKILL.md
• CHANGELOG.md
• scripts/bootstrap.sh
• scripts/lsp_client.py
• tests/fixture/bad.py
• tests/fixture/pkg/__init__.py
• tests/fixture/pkg/models.py
• tests/fixture/pkg/other.py
• tests/fixture/pkg/service.py
• tests/test_lsp_client.py

Open the folder on GitHubat commit 559a6cd