Agent-watchdog
Runtime loop detection for LangGraph agents
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Multi-agent LLM pipelines fail quietly — agents rephrasing the same argument forever, silent deadlocks, graphs that cycle without an exit. Most tools (LangSmith, AgentOps) show you this after the fact. Agent Watchdog intervenes at runtime, like a circuit breaker — watching message similarity and tool-call patterns to halt stuck LangGraph runs before you burn tokens. Built by PengKernel LLC: npm install agent-watchdog.
PH · launched Sep 21, 2026 · 2 upvotes (top 26%) · 2 views
Niche: ai agent security and monitoring tools · 297 launches, 14 in the last 7 days ▼ -44% · Explore this niche →
Category and tags
- Horizontal
- Observability & eval
- Developer
- AI-native
- Hobby / open-source project
- Developer Tools
- Artificial Intelligence
Visit website ↗ Source listing ↗
More like this: all 297 launches in ai agent security and monitoring tools →
Could you build this?
Yes The tool is a lightweight Python/TypeScript middleware wrapper or LangGraph callback that tracks message history, calculates cosine similarity on embeddings, and interrupts graph execution if a loop threshold is exceeded.
Competitors
Other products that read as similar to this one : 485 launches clear the similarity bar, closest 8 shown.
Attention rank: #151 of 486 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 300 days after the earliest competitor.
- AgentWatch · hn · 2026-06-28 · 7 upvotes · similarity 0.51
- Critiqor · ph · 2026-10-05 · 2 upvotes · similarity 0.47
- Watchdog — Guardian Agent Supervision · ph · 2026-10-23 · 1 upvotes · similarity 0.47
- Agentwall · ph · 2026-09-09 · 2 upvotes · similarity 0.46
- Agent-contracts, contract-based LangGraph agents · hn · 2026-01-09 · 8 upvotes · similarity 0.46
- AI WatchDog · ph · 2026-10-04 · 1 upvotes · similarity 0.46
- SharpLogic · ph · 2026-10-29 · 1 upvotes · similarity 0.45
- Reflexes API: Catch what agent logs miss · yc · 2026-06-27 · 5 upvotes · similarity 0.44
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