fix: preserve tool failures under noisy output

agent_platform/gateway/provider.py

@@ -19,6 +19,7 @@ from docker.errors import ImageNotFound, NotFound
 import docker
 from agent_platform.config import Settings
 from agent_platform.gateway.schemas import ToolResult, WorkspaceListing, WorkspaceStatus
+from agent_platform.text import truncate_middle
 
 
 def normalize_workspace_path(raw_path: str) -> PurePosixPath:
@@ -208,7 +209,7 @@ class DockerExecutionProvider:
             output = ((stdout or b"") + (stderr or b"")).decode("utf-8", errors="replace")
             truncated = len(output) > max_output
             if truncated:
-                output = output[:max_output] + "\n… output truncated …"
+                output = truncate_middle(output, max_output, "\n… output truncated; middle omitted …\n")
             return ToolResult(
                 ok=result.exit_code == 0,
                 output=output,

agent_platform/runtime/loop.py

@@ -77,6 +77,7 @@ VERIFICATION_TOOLS = {"read_file", "git_status", "git_diff", "exec", "poll_proce
 EXECUTION_TOOLS = {"exec", "start_process", "poll_process"}
 REPEAT_GUARDED_EXECUTION_TOOLS = {"exec", "start_process"}
 MAX_CONSECUTIVE_CHECKPOINT_REJECTIONS = 3
+MAX_TOOL_CALLS_PER_ITERATION = 8
 CODE_FILE_SUFFIXES = {
     ".c",
     ".cc",
@@ -568,6 +569,17 @@ class AgentLoop:
                     )
                 return candidate
 
+            if len(tool_calls) > MAX_TOOL_CALLS_PER_ITERATION:
+                await recorder.emit(
+                    "tool.batch_limited",
+                    {
+                        "requested": len(tool_calls),
+                        "accepted": MAX_TOOL_CALLS_PER_ITERATION,
+                        "iteration": iteration + 1,
+                        "depth": depth,
+                    },
+                )
+                tool_calls = tool_calls[:MAX_TOOL_CALLS_PER_ITERATION]
             consecutive_checkpoint_rejections = 0
             assistant_message = {
                 "role": "assistant",

agent_platform/runtime/tools.py

@@ -10,6 +10,7 @@ from agent_platform.auth import UserIdentity
 from agent_platform.config import Settings
 from agent_platform.runtime.schemas import PlanItem
 from agent_platform.store import RuntimeStore
+from agent_platform.text import truncate_middle
 
 
 @dataclass(frozen=True, slots=True)
@@ -337,6 +338,4 @@ class ToolRegistry:
 
 def tool_result_text(result: Any, limit: int) -> str:
     text = json.dumps(result, ensure_ascii=False, separators=(",", ":"), default=str)
-    if len(text) <= limit:
-        return text
-    return text[:limit] + "…"
+    return truncate_middle(text, limit)

agent_platform/text.py

@@ -0,0 +1,15 @@
+from __future__ import annotations
+
+
+def truncate_middle(text: str, limit: int, marker: str = "\n… middle omitted …\n") -> str:
+    if limit <= 0:
+        return ""
+    if len(text) <= limit:
+        return text
+    if limit <= len(marker):
+        return text[:limit]
+    remaining = limit - len(marker)
+    head = (remaining + 1) // 2
+    tail = remaining - head
+    suffix = text[-tail:] if tail else ""
+    return text[:head] + marker + suffix