Lsp Implement

What it does

When your agent uses it

• You need to know what types satisfy an interface
• What subtypes exist before changing a base type

Example prompts

• “/lsp-implement”

Requirements

• Compatibility (from SKILL.md): Requires the agent-lsp MCP server (github.com/blackwell-systems/agent-lsp)
• Pre-approved tools (allowed-tools): mcp__lsp__start_lsp, mcp__lsp__get_server_capabilities, mcp__lsp__go_to_symbol, mcp__lsp__go_to_implementation, mcp__lsp__type_hierarchy, mcp__lsp__open_document

Workflow steps

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

1. 1Locate the interface or type
2. 2Find all implementations
3. 3Type hierarchy (subtypes and supertypes)
4. 4Report

What it can do on your machine

Read from SKILL.md and the folder at commit 6fa5faf. 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__start_lsp
  • mcp__lsp__get_server_capabilities
  • mcp__lsp__go_to_symbol
  • mcp__lsp__go_to_implementation
  • mcp__lsp__type_hierarchy
  • mcp__lsp__open_document

  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 Implement loads about 1.2k tokens when it runs. Until then it costs about 48 tokens; SKILL.md has 355 words of instructions outside code blocks.

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

~48

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

~1.2k

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 6fa5faf, republished under its MIT licence (© blackwell-systems). 355 words, ~1,155 tokens.

name

lsp-implement

description

Find all concrete implementations of an interface or abstract type. Use when you need to know what types satisfy an interface, or what subtypes exist before changing a base type.

allowed-tools

mcp__lsp__start_lsp, mcp__lsp__get_server_capabilities, mcp__lsp__go_to_symbol, mcp__lsp__go_to_implementation, mcp__lsp__type_hierarchy, mcp__lsp__open_document

compatibility

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

argument-hint

[interface-or-type-name]

user-invocable

true

license

MIT

metadata.required-capabilities

implementationProvider

metadata.optional-capabilities

typeHierarchyProvider workspaceSymbolProvider

mcp__lsp__get_server_capabilities()

mcp__lsp__go_to_symbol({
  "symbol_path": "<TypeName>",
  "workspace_root": "/abs/path"   // optional
})
→ returns: file, line, column (1-indexed)

mcp__lsp__open_document({
  "file_path": "<file from go_to_symbol>"
})

mcp__lsp__go_to_implementation({
  "file_path": "<file>",
  "line": <line>,
  "column": <column>
})

mcp__lsp__type_hierarchy({
  "file_path": "<file>",
  "line": <line>,
  "column": <column>,
  "direction": "subtypes"   // use "both" to also see what this type extends
})

## Implementation Report: <TypeName>

### Definition
- File: <file>:<line>
- Kind: interface / abstract type / base struct

### Concrete Implementations (<N> found)
- TypeA — <file>:<line>
- TypeB — <file>:<line>
...

### Type Hierarchy
Supertypes: [list or "none"]
Subtypes: [list or "same as implementations above" or "not supported"]

### Risk Assessment
| N implementations | Recommendation |
|---|---|
| 0 | Interface unused or no external implementors found. May be internal-only. |
| 1–3 | Low risk. All implementors can be updated together. |
| 4–10 | Medium risk. Plan updates package by package. |
| > 10 | High risk. Changing the interface is a breaking API change. |

© 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-implement of blackwell-systems/agent-lsp.

Open the folder on GitHubat commit 6fa5faf