Lsp Impact

What it does

When your agent uses it

• Changing the signature of any function
• Tasks that involve Refactoring

Example prompts

• “/lsp-impact”

Requirements

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

Workflow steps

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

1. 1File-level entry (when user provides a file path)
2. 2Locate the symbol
3. 3Enumerate all direct references (always available)
4. 4Call hierarchy (callers and callees)
5. 5Type hierarchy (supertypes and subtypes)
6. 6Report impact surface

What it can do on your machine

Read from SKILL.md and the folder at commit 38ca488. 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__go_to_symbol
  • mcp__lsp__find_callers
  • mcp__lsp__type_hierarchy
  • mcp__lsp__find_references
  • mcp__lsp__get_server_capabilities
  • mcp__lsp__blast_radius

  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 Impact loads about 1.8k tokens when it runs, and up to ~3k if it reads all its reference files. Until then it costs about 78 tokens; SKILL.md has 618 words of instructions outside code blocks.

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

~78

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

~1.8k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~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 38ca488, republished under its MIT licence (© blackwell-systems). 618 words, ~1,803 tokens.

name

lsp-impact

description

Blast-radius analysis for a symbol or file — shows all callers, type supertypes/subtypes, and reference count before you change it. Use when refactoring, deleting, or changing the signature of any function, type, or method. Also accepts a file path to surface all exported-symbol impact in one shot.

allowed-tools

mcp__lsp__go_to_symbol, mcp__lsp__find_callers, mcp__lsp__type_hierarchy, mcp__lsp__find_references, mcp__lsp__get_server_capabilities, mcp__lsp__blast_radius

compatibility

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

argument-hint

[symbol-name | file-path]

user-invocable

true

license

MIT

metadata.required-capabilities

referencesProvider

metadata.optional-capabilities

callHierarchyProvider typeHierarchyProvider workspaceSymbolProvider

mcp__lsp__blast_radius({
  "changed_files": ["/abs/path/to/file.go"],
  "include_transitive": false   // set true to surface second-order callers
})

mcp__lsp__get_server_capabilities()

mcp__lsp__go_to_symbol({
  "symbol_path": "Package.SymbolName",
  "workspace_root": "/abs/path"   // optional, narrows scope
})
→ returns: file, line, column (1-indexed)

mcp__lsp__find_references({
  "file_path": "<file from Step 1>",
  "position_pattern": "func @@SymbolName(",   // adjust prefix for symbol kind
  "include_declaration": false
})

mcp__lsp__find_callers({
  "file_path": "<file from Step 1>",
  "line": <line from Step 1>,
  "column": <column from Step 1>,
  "direction": "incoming"   // use "both" if callees are also needed
})

mcp__lsp__type_hierarchy({
  "file_path": "<file from Step 1>",
  "line": <line from Step 1>,
  "column": <column from Step 1>,
  "direction": "both"
})

Goal: assess blast radius of exported function `ParseConfig` in pkg/config

Prerequisites — get_server_capabilities:
  → supported_tools: [go_to_symbol, find_references, find_callers, ...]
  → type_hierarchy: not in supported_tools

Step 1 — go_to_symbol: symbol_path="config.ParseConfig"
  → pkg/config/parser.go:42:6

Step 2 — find_references: position_pattern="func @@ParseConfig("
  → 7 references in 4 files
  → cmd/main.go, internal/app.go, internal/loader.go, pkg/config/parser_test.go

Step 3 — find_callers: direction="incoming"
  → callers: cmd.main (cmd/main.go:14), app.Start (internal/app.go:31), ...

Step 4 — type_hierarchy: skipped (function), also not supported by server

Step 5 — Impact Report:
  ## Impact Report: ParseConfig
  - Kind:         function
  - Definition:   pkg/config/parser.go:42:6
  - References:   7 across 4 files
  ...
  - Risk level:   low

© 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

SKILL.md and 1 other file (references) in skills/lsp-impact of blackwell-systems/agent-lsp.

• SKILL.md
• references/patterns.md

Open the folder on GitHubat commit 38ca488