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openclaw/docs/tools/loop-detection.md

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+---
+title: "Tool-loop detection"
+summary: "How to enable and tune guardrails that detect repetitive tool-call loops"
+read_when:
+  - A user reports agents getting stuck repeating tool calls
+  - You need to tune repetitive-call protection
+  - You are editing agent tool/runtime policies
+---
+
+# Tool-loop detection
+
+OpenClaw can keep agents from getting stuck in repeated tool-call patterns.
+The guard is **disabled by default**.
+
+Enable it only where needed, because it can block legitimate repeated calls with strict settings.
+
+## Why this exists
+
+- Detect repetitive sequences that do not make progress.
+- Detect high-frequency no-result loops (same tool, same inputs, repeated errors).
+- Detect specific repeated-call patterns for known polling tools.
+
+## Configuration block
+
+Global defaults:
+
+```json5
+{
+  tools: {
+    loopDetection: {
+      enabled: false,
+      historySize: 30,
+      warningThreshold: 10,
+      criticalThreshold: 20,
+      globalCircuitBreakerThreshold: 30,
+      detectors: {
+        genericRepeat: true,
+        knownPollNoProgress: true,
+        pingPong: true,
+      },
+    },
+  },
+}
+```
+
+Per-agent override (optional):
+
+```json5
+{
+  agents: {
+    list: [
+      {
+        id: "safe-runner",
+        tools: {
+          loopDetection: {
+            enabled: true,
+            warningThreshold: 8,
+            criticalThreshold: 16,
+          },
+        },
+      },
+    ],
+  },
+}
+```
+
+### Field behavior
+
+- `enabled`: Master switch. `false` means no loop detection is performed.
+- `historySize`: number of recent tool calls kept for analysis.
+- `warningThreshold`: threshold before classifying a pattern as warning-only.
+- `criticalThreshold`: threshold for blocking repetitive loop patterns.
+- `globalCircuitBreakerThreshold`: global no-progress breaker threshold.
+- `detectors.genericRepeat`: detects repeated same-tool + same-params patterns.
+- `detectors.knownPollNoProgress`: detects known polling-like patterns with no state change.
+- `detectors.pingPong`: detects alternating ping-pong patterns.
+
+## Recommended setup
+
+- Start with `enabled: true`, defaults unchanged.
+- Keep thresholds ordered as `warningThreshold < criticalThreshold < globalCircuitBreakerThreshold`.
+- If false positives occur:
+  - raise `warningThreshold` and/or `criticalThreshold`
+  - (optionally) raise `globalCircuitBreakerThreshold`
+  - disable only the detector causing issues
+  - reduce `historySize` for less strict historical context
+
+## Logs and expected behavior
+
+When a loop is detected, OpenClaw reports a loop event and blocks or dampens the next tool-cycle depending on severity.
+This protects users from runaway token spend and lockups while preserving normal tool access.
+
+- Prefer warning and temporary suppression first.
+- Escalate only when repeated evidence accumulates.
+
+## Notes
+
+- `tools.loopDetection` is merged with agent-level overrides.
+- Per-agent config fully overrides or extends global values.
+- If no config exists, guardrails stay off.