# 🔧 Tool-Router Debug — Finding & Fixing Mis-Routed Function Calls _A rigorous playbook for multi-agent / multi-tool pipelines that “pick the wrong tool, pass the wrong args, or loop forever.”_ --- ## 1 Why Tool Routers Break Modern frameworks (LangChain, LlamaIndex, Autogen, Dust, Function-Calling APIs) rely on a **router layer** that decides: 1. **Which tool or agent** to invoke 2. **What arguments** to pass 3. **Whether to chain the result into further reasoning A single bad route produces silent failure: * Wrong tool → irrelevant data * Wrong args → empty response / 400 error * Infinite recurse → rate-limit burn > _Observability is near zero._ > Routers often return only the final model output, hiding the mis-route upstream. --- ## 2 Early Symptoms (Spot Them in Seconds) | Symptom | How to Detect Quickly | Typical Root Cause | |---------|----------------------|--------------------| | Same tool called twice, two answers conflict | Diff JSON traces | Score tie in router logits | | Model asks follow-up Q that a tool already answered | Compare tool log vs. chat | Tool result not fed back | | 429 / rate-limit spikes | Metrics: calls/min | Retry loop on failed tool | | Agent says “I don’t have that data” yet DB tool exists | ΔS(question, available_tools) > 0.60 | Tool description drift | | Router latency > 2× normal | Timing logs | Exhaustive eval over 20+ irrelevant tools | --- ## 3 Root Causes (Technical) 1. **Shallow Tool Descriptions** – No semantic anchor → high ΔS. 2. **Score Tie / Softmax Blur** – Top-2 tools within 0.02 probability. 3. **Argument Schema Mismatch** – JSON schema vs. natural language spec. 4. **Context Window Loss** – Router prompt trimmed; tool list truncated. 5. **Recursive Agent Calls** – Tool calls another agent that loops back. --- ## 4 WFGY Router-Guard Architecture | Stage | Module | Purpose | |-------|--------|---------| | 4.1 **Tool Semantic Index** | BBMC | Pre-embed tool names + desc; enforce ΔS(tool, question) ceiling | | 4.2 **ΔS-Gate Router** | ΔS + λ_observe | Accept route only if ΔS ≤ 0.45 and λ remains convergent | | 4.3 **Argument Linter** | WAI | Validate args against JSON schema; auto-fill defaults | | 4.4 **BBCR Fail-Fast** | BBCR | On router timeout > 5 s or ΔS > 0.60 → collapse & suggest manual pick | | 4.5 **Trace Logger** | Bloc/Trace | Records (tool, args, ΔS) tuples for replay & audit | --- ## 5 Hands-On Debug Checklist 1. **Log the router call** ```python router(question, tool_list, debug=True) 2. **Compute ΔS(question, tool\_desc)** for each tool. * Flag any route where ΔS > 0.45 **AND** score\_gap < 0.05. 3. **Schema Validate** arguments (`jsonschema.validate`). 4. **Timeout Guard** – If tool takes > x s, BBCR collapses answer and returns: “Tool timeout — please choose from: …” 5. **Replay** failing routes with `router_replay(id)`; inspect λ\_observe transitions. --- ## 6 Quick-Reference Table — Fixes by Failure | Failure Pattern | Instant Fix | Long-Term Fix | | ------------------ | ----------------------------------------------------- | --------------------------------------------------- | | Wrong tool picked | Add 1-line alias to tool desc; update embedding index | BBMC repack all tool descriptions weekly | | Empty args | Add default arg hints (`"default": "query"`) | Argument linter auto-fills | | Looping agent-tool | λ flips recursive after call 3 | Hard cap depth = 2; BBCR break | | Tie between tools | Score diff < 0.05 | Ask follow-up clarifier; BBAM damp ambiguous logits | | Router silence | No tool chosen | Add catch-all “NoTool” that surfaces to dev | --- ## 7 Validation Metrics | Metric | Target | | --------------------------------- | -------------- | | **Route accuracy** (ground truth) | ≥ 95 % | | **ΔS(question, picked\_tool)** | ≤ 0.45 median | | **Mean tool latency** | ±10 % baseline | | **Loop depth** | ≤ 2 | | **Arg schema errors** | 0 in CI suite | --- ## 8 FAQ **Q:** *Should I embed tool names or full descriptions?* **A:** Both; concatenate `name + desc + example` for robust ΔS. **Q:** *What if multiple tools validly answer?* **A:** Route to aggregator agent; return merged citations. WFGY ΔS-gate ensures each tool still semantically fits. **Q:** *Do I need BBCR if I already set retries=0?* **A:** Yes. BBCR guards logic loops, not HTTP retries. --- ### 🔗 Quick-Start Downloads (60 sec) | Tool | Link | 3-Step Setup | |------|------|--------------| | **WFGY 1.0 PDF** | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + \” | | **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt) | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly | --- ### 🧭 Explore More | Module | Description | Link | |-----------------------|----------------------------------------------------------|----------| | WFGY Core | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md) | | Problem Map 1.0 | Initial 16-mode diagnostic and symbolic fix framework | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md) | | Problem Map 2.0 | RAG-focused failure tree, modular fixes, and pipelines | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) | | Semantic Clinic Index | Expanded failure catalog: prompt injection, memory bugs, logic drift | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md) | | Semantic Blueprint | Layer-based symbolic reasoning & semantic modulations | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md) | | Benchmark vs GPT-5 | Stress test GPT-5 with full WFGY reasoning suite | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md) | | 🧙‍♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md) | --- > 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)** — > Engineers, hackers, and open source builders who supported WFGY from day one. > GitHub stars ⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
[![WFGY Main](https://img.shields.io/badge/WFGY-Main-red?style=flat-square)](https://github.com/onestardao/WFGY)   [![TXT OS](https://img.shields.io/badge/TXT%20OS-Reasoning%20OS-orange?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS)   [![Blah](https://img.shields.io/badge/Blah-Semantic%20Embed-yellow?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlahBlahBlah)   [![Blot](https://img.shields.io/badge/Blot-Persona%20Core-green?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlotBlotBlot)   [![Bloc](https://img.shields.io/badge/Bloc-Reasoning%20Compiler-blue?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlocBlocBloc)   [![Blur](https://img.shields.io/badge/Blur-Text2Image%20Engine-navy?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlurBlurBlur)   [![Blow](https://img.shields.io/badge/Blow-Game%20Logic-purple?style=flat-square)](https://github.com/onestardao/WFGY/tree/main/OS/BlowBlowBlow)