feat(mcp): register lsp tier-1 stdio MCP server

src/mcp/lsp.ts

@@ -0,0 +1,48 @@
+import { existsSync } from "node:fs"
+import { resolve } from "node:path"
+import { fileURLToPath } from "node:url"
+
+const SUBMODULE_REL = "vendor/lsp-tools-mcp"
+const CLI_REL = "dist/cli.js"
+const PROJECT_LSP_CONFIG = ".opencode/lsp.json"
+
+export type LocalMcpConfig = {
+  type: "local"
+  command: string[]
+  enabled: boolean
+  environment?: Record<string, string>
+}
+
+function resolveLspCliPathCandidates(): string[] {
+  const candidates: string[] = []
+
+  try {
+    const currentFilePath = fileURLToPath(import.meta.url)
+    candidates.push(resolve(currentFilePath, "..", "..", "..", SUBMODULE_REL, CLI_REL))
+    candidates.push(resolve(currentFilePath, "..", "..", SUBMODULE_REL, CLI_REL))
+    candidates.push(resolve(currentFilePath, "..", SUBMODULE_REL, CLI_REL))
+  } catch {
+    // ignore and fall through to cwd-based candidate
+  }
+
+  candidates.push(resolve(process.cwd(), SUBMODULE_REL, CLI_REL))
+
+  return candidates
+}
+
+export function createLspMcpConfig(): LocalMcpConfig | null {
+  const cliPath = resolveLspCliPathCandidates().find((candidatePath) => existsSync(candidatePath))
+
+  if (!cliPath) {
+    return null
+  }
+
+  return {
+    type: "local",
+    command: ["node", cliPath, "mcp"],
+    enabled: true,
+    environment: {
+      LSP_TOOLS_MCP_PROJECT_CONFIG: PROJECT_LSP_CONFIG,
+    },
+  }
+}