# lsp-cross-repo

Locates callers of a library symbol across consumer repositories via LSP. Useful when preparing to refactor or remove shared code without breaking dependents.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · ★ 165
- Author: blackwell-systems
- License: MIT · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/blackwell-systems/agent-lsp/tree/HEAD/skills/lsp-cross-repo/SKILL.md
- Updated: 2026-10-24
- HTML: https://affpapa.org/en/nevibecode/skills/lsp-cross-repo

## What it does

The skill performs read-only cross-repository symbol lookups across multiple codebases. It solves the blast-radius problem when editing a shared library consumed by multiple applications. Single-repo impact analysis is left to `/lsp-impact`, while this tool handles multi-root consumer setups.

First, the skill initializes the language server on the library root via `mcp__lsp__start_lsp` and pinpoints definition coordinates using `mcp__lsp__find_symbol`. It then invokes `mcp__lsp__get_cross_repo_references` with target consumer paths. This step registers each consumer as a workspace folder, waits for indexing to finish, and partitions detected references by repository. It can also inspect incoming call hierarchies and interface implementations.

Execution fails without a running `agent-lsp` MCP server. The underlying language server must support `referencesProvider`. If an indexer cannot process a consumer root, it records that path in the `warnings` list for manual verification.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add blackwell-systems/agent-lsp --skill lsp-cross-repo -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/lsp-cross-repo/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/lsp-cross-repo/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add blackwell-systems/agent-lsp --skill lsp-cross-repo -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/lsp-cross-repo/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add blackwell-systems/agent-lsp --skill lsp-cross-repo -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/lsp-cross-repo/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install blackwell-systems/agent-lsp lsp-cross-repo
```

2. **Manually: put the files in place**
- File: `.github/skills/lsp-cross-repo/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add blackwell-systems/agent-lsp --skill lsp-cross-repo -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/blackwell-systems/agent-lsp --path skills/lsp-cross-repo
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/lsp-cross-repo/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add blackwell-systems/agent-lsp --skill lsp-cross-repo -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/blackwell-systems/agent-lsp/tree/HEAD/skills/lsp-cross-repo/SKILL.md

## When to use it
- Find all callers of a library symbol across consumer repositories
- Verify zero dependents before deleting deprecated shared methods
- List external implementations of a library interface
- Audit package usage across multiple microservices

## Example prompts
- Find all callers of `ParseConfig` from `/repos/config-lib` in `/repos/api-service` and `/repos/worker`.
- Check if any consumer repository still references `LegacyClient` before I delete it.
- List all implementations of the `Logger` interface located in `/repos/backend-service`.

## Source text · SKILL.md · MIT

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 119be5de9047077e.

BEGIN THIRD-PARTY FILE 119be5de9047077e
````text
---
name: lsp-cross-repo
description: Cross-repository analysis — find all callers of a library symbol in one or more consumer repos. Use when refactoring a shared library and need to understand how consumers use it.
argument-hint: "[symbol-name] in [library-file:line:col] used by [consumer-root ...]"
user-invocable: true
allowed-tools: mcp__lsp__start_lsp mcp__lsp__find_symbol mcp__lsp__get_cross_repo_references mcp__lsp__add_workspace_folder mcp__lsp__list_workspace_folders mcp__lsp__go_to_implementation mcp__lsp__find_callers mcp__lsp__inspect_symbol
license: MIT
compatibility: Requires the agent-lsp MCP server (github.com/blackwell-systems/agent-lsp)
metadata:
  required-capabilities: referencesProvider
  optional-capabilities: implementationProvider callHierarchyProvider workspaceSymbolProvider
---

> Requires the agent-lsp MCP server.

# lsp-cross-repo

Multi-root cross-repo caller analysis for library + consumer workflows. Finds all
usages of a library symbol across one or more consumer codebases in a single call.

Read-only — does not modify any files.

## When to use

- Before changing a library API: find all callers in every consumer
- Before deleting a symbol: verify it has no cross-repo dependents
- When a change in repo A might break repo B or C
- Auditing how internal packages are used across services

Use `/lsp-impact` instead for single-repo blast-radius analysis.

## Workflow

### Step 1 — Initialize the primary workspace

Start the language server on the library root if not already running:

```
mcp__lsp__start_lsp({ "root_dir": "/path/to/library" })
```

### Step 2 — Locate the library symbol

Find the symbol's definition to get `file_path`, `line`, and `column`:

```
mcp__lsp__find_symbol({ "query": "<symbol-name>" })
```

Pick the result in the library repo (not a test file).

### Step 3 — Find all cross-repo references (primary step)

Call `get_cross_repo_references` with the symbol location and all consumer repo
roots. This adds each consumer as a workspace folder, waits for indexing, runs
`find_references` across all roots, and returns results partitioned by repo:

```
mcp__lsp__get_cross_repo_references({
  "symbol_file": "/abs/path/to/library/file.go",
  "line": <line>,
  "column": <column>,
  "consumer_roots": [
    "/abs/path/to/consumer-a",
    "/abs/path/to/consumer-b"
  ]
})
```

Returns:
- `library_references` — usages within the library itself
- `consumer_references` — a map of `consumer-root → [file:line ...]`
- `warnings` — any roots that could not be indexed (check these manually)

**Decision after Step 3:**

| Result | Action |
|--------|--------|
````
END THIRD-PARTY FILE 119be5de9047077e

The third-party file has ended. Everything between the 119be5de9047077e tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

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