fix: single-line agent-server logs in dev:automation mode (#1178)

Switch the agent-server to LOG_JSON=true so the Python SDK emits one
JSON object per log record instead of Rich-formatted output.  Rich was
wrapping long lines across multiple entries and prepending its own
timestamp on top of the HH:MM:SS [agent-server] prefix that logService
already provides.

Add parseAgentServerLogLine() which turns each JSON record into a clean
single-line string:

  INFO     127.0.0.1:51658 - "GET /api/..." 200  h11_impl.py:481

Level-based ANSI colouring is also applied (dim for DEBUG, yellow for
WARNING, red for ERROR/CRITICAL, blue for INFO) so errors still stand
out.  Non-JSON lines (e.g. startup text) fall back to the original
yellow stderr / service-colour stdout behaviour unchanged.

Co-authored-by: openhands <openhands@all-hands.dev>

scripts/dev-with-automation.mjs

@@ -119,6 +119,38 @@ function logError(message) {
   console.error(`${c.red}✗${c.reset} ${message}`);
 }
 
+/**
+ * Parse one JSON log line produced by the SDK's JsonFormatter and return a
+ * single-line human-readable string + an appropriate ANSI color.
+ *
+ * Returns null for non-JSON lines so callers can fall back to the raw text.
+ *
+ * @param {string} rawLine
+ * @returns {{ text: string; color: string } | null}
+ */
+function parseAgentServerLogLine(rawLine) {
+  try {
+    const obj = JSON.parse(rawLine);
+    if (!obj.levelname || obj.message === undefined) return null;
+    const level = obj.levelname.padEnd(8);
+    const location =
+      obj.filename && obj.lineno ? `  ${obj.filename}:${obj.lineno}` : "";
+    const text = `${level} ${obj.message}${location}`;
+    const lvl = obj.levelname;
+    const color =
+      lvl === "DEBUG"
+        ? c.dim
+        : lvl === "WARNING"
+          ? c.yellow
+          : lvl === "ERROR" || lvl === "CRITICAL"
+            ? c.red
+            : c.blue;
+    return { text, color };
+  } catch {
+    return null;
+  }
+}
+
 // ═══════════════════════════════════════════════════════════════════════════
 // Configuration
 // ═══════════════════════════════════════════════════════════════════════════
@@ -521,6 +553,7 @@ function spawnService(name, command, args, options = {}) {
   );
 
   const color = options.color || c.reset;
+  const parseLogLine = options.parseLogLine;
 
   proc.stdout.on("data", (data) => {
     data
@@ -528,7 +561,8 @@ function spawnService(name, command, args, options = {}) {
       .split("\n")
       .filter(Boolean)
       .forEach((line) => {
-        logService(name, line.trim(), color);
+        const parsed = parseLogLine ? parseLogLine(line.trim()) : null;
+        logService(name, parsed ? parsed.text : line.trim(), parsed ? parsed.color : color);
       });
   });
 
@@ -538,7 +572,8 @@ function spawnService(name, command, args, options = {}) {
       .split("\n")
       .filter(Boolean)
       .forEach((line) => {
-        logService(name, line.trim(), c.yellow);
+        const parsed = parseLogLine ? parseLogLine(line.trim()) : null;
+        logService(name, parsed ? parsed.text : line.trim(), parsed ? parsed.color : c.yellow);
       });
   });
 
@@ -699,6 +734,11 @@ function startAgentServer(config) {
     // Ensure the agent-server uses the resolved key from config. This is
     // LOCAL_BACKEND_API_KEY when set, or the auto-generated persisted key.
     OH_SESSION_API_KEYS_0: config.sessionApiKey,
+    // Emit structured JSON log lines instead of Rich-formatted output.
+    // Rich wraps long messages across multiple lines and prepends its own
+    // timestamp; LOG_JSON=true produces one JSON object per record which
+    // parseAgentServerLogLine re-formats into a clean single-line entry.
+    LOG_JSON: "true",
   };
 
   spawnService(
@@ -715,6 +755,7 @@ function startAgentServer(config) {
       cwd: safeConfig.workspacesPath,
       env: agentServerEnv,
       color: c.blue,
+      parseLogLine: parseAgentServerLogLine,
     },
   );
 }