Lsp Format Code

What it does

When your agent uses it

• Tasks that involve Linting and formatting

Example prompts

• “/lsp-format-code”

Requirements

• Python 3
• Compatibility (from SKILL.md): Requires the agent-lsp MCP server (github.com/blackwell-systems/agent-lsp)
• Pre-approved tools (allowed-tools): mcp__lsp__open_document, mcp__lsp__format_document, mcp__lsp__format_range, mcp__lsp__apply_edit, mcp__lsp__get_diagnostics, mcp__lsp__get_server_capabilities

Workflow steps

5 steps, taken from the step headings in SKILL.md.

1. 1Check formatting is supported (optional)
2. 2Open the file
3. 3Request formatting edits
4. 4Apply the edits
5. 5Verify (optional but recommended)

What it can do on your machine

Read from SKILL.md and the folder at commit 09ea99e. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • mcp__lsp__open_document
  • mcp__lsp__format_document
  • mcp__lsp__format_range
  • mcp__lsp__apply_edit
  • mcp__lsp__get_diagnostics
  • mcp__lsp__get_server_capabilities

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md.

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

• Network

  No URLs in SKILL.md.

  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.

• Compatibility

  Requires the agent-lsp MCP server (github.com/blackwell-systems/agent-lsp)

  From compatibility in the SKILL.md frontmatter.

Context cost

Lsp Format Code loads about 1.3k tokens when it runs. Until then it costs about 60 tokens; SKILL.md has 445 words of instructions outside code blocks.

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

~60

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

~1.3k

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from blackwell-systems/agent-lsp at commit 09ea99e, republished under its MIT licence (© blackwell-systems). 445 words, ~1,273 tokens.

name

lsp-format-code

description

Format a file or selection using the language server's formatter. Use before committing to apply consistent style, or after generating code to clean up indentation and spacing. Supports full-file and range-based formatting.

allowed-tools

mcp__lsp__open_document, mcp__lsp__format_document, mcp__lsp__format_range, mcp__lsp__apply_edit, mcp__lsp__get_diagnostics, mcp__lsp__get_server_capabilities

compatibility

Requires the agent-lsp MCP server (github.com/blackwell-systems/agent-lsp)

argument-hint

[file-path] [optional: start_line-end_line]

user-invocable

true

license

MIT

metadata.required-capabilities

documentFormattingProvider

metadata.optional-capabilities

documentRangeFormattingProvider

mcp__lsp__get_server_capabilities({ "file_path": "<file>" })

mcp__lsp__open_document({ "file_path": "/abs/path/to/file.go", "language_id": "go" })

mcp__lsp__format_document({ "file_path": "/abs/path/to/file.go" })

mcp__lsp__format_range({
  "file_path": "/abs/path/to/file.go",
  "start_line": <N>,
  "end_line": <M>
})

mcp__lsp__apply_edit({ "workspace_edit": <TextEdit[] from Step 3> })

mcp__lsp__get_diagnostics({ "file_path": "/abs/path/to/file.go" })

## Format result: <filename>

Changes applied: N edits
Lines affected: <range or "whole file">
Formatter: <gopls | typescript-language-server | rust-analyzer | ...>

Status: FORMATTED ✓

Status: ALREADY FORMATTED — no changes needed

Status: NOT SUPPORTED — <server> does not expose documentFormattingProvider
Fallback: run the formatter directly (gofmt, prettier, rustfmt, etc.)

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

Files

Just SKILL.md in skills/lsp-format-code of blackwell-systems/agent-lsp.

Open the folder on GitHubat commit 09ea99e