feat: surface repo root in runtime prompt

src/agents/system-prompt-params.ts

@@ -1,3 +1,6 @@
+import fs from "node:fs";
+import path from "node:path";
+
 import type { ClawdbotConfig } from "../config/config.js";
 import {
   formatUserTime,
@@ -18,6 +21,7 @@ export type RuntimeInfoInput = {
   capabilities?: string[];
   /** Supported message actions for the current channel (e.g., react, edit, unsend) */
   channelActions?: string[];
+  repoRoot?: string;
 };
 
 export type SystemPromptRuntimeParams = {
@@ -31,7 +35,14 @@ export function buildSystemPromptParams(params: {
   config?: ClawdbotConfig;
   agentId?: string;
   runtime: Omit<RuntimeInfoInput, "agentId">;
+  workspaceDir?: string;
+  cwd?: string;
 }): SystemPromptRuntimeParams {
+  const repoRoot = resolveRepoRoot({
+    config: params.config,
+    workspaceDir: params.workspaceDir,
+    cwd: params.cwd,
+  });
   const userTimezone = resolveUserTimezone(params.config?.agents?.defaults?.userTimezone);
   const userTimeFormat = resolveUserTimeFormat(params.config?.agents?.defaults?.timeFormat);
   const userTime = formatUserTime(new Date(), userTimezone, userTimeFormat);
@@ -39,9 +50,56 @@ export function buildSystemPromptParams(params: {
     runtimeInfo: {
       agentId: params.agentId,
       ...params.runtime,
+      repoRoot,
     },
     userTimezone,
     userTime,
     userTimeFormat,
   };
 }
+
+function resolveRepoRoot(params: {
+  config?: ClawdbotConfig;
+  workspaceDir?: string;
+  cwd?: string;
+}): string | undefined {
+  const configured = params.config?.agents?.defaults?.repoRoot?.trim();
+  if (configured) {
+    try {
+      const resolved = path.resolve(configured);
+      const stat = fs.statSync(resolved);
+      if (stat.isDirectory()) return resolved;
+    } catch {
+      // ignore invalid config path
+    }
+  }
+  const candidates = [params.workspaceDir, params.cwd]
+    .map((value) => value?.trim())
+    .filter(Boolean) as string[];
+  const seen = new Set<string>();
+  for (const candidate of candidates) {
+    const resolved = path.resolve(candidate);
+    if (seen.has(resolved)) continue;
+    seen.add(resolved);
+    const root = findGitRoot(resolved);
+    if (root) return root;
+  }
+  return undefined;
+}
+
+function findGitRoot(startDir: string): string | null {
+  let current = path.resolve(startDir);
+  for (let i = 0; i < 12; i += 1) {
+    const gitPath = path.join(current, ".git");
+    try {
+      const stat = fs.statSync(gitPath);
+      if (stat.isDirectory() || stat.isFile()) return current;
+    } catch {
+      // ignore missing .git at this level
+    }
+    const parent = path.dirname(current);
+    if (parent === current) break;
+    current = parent;
+  }
+  return null;
+}