Merge pull request #120 from IRONICBo/docs/tavily-configuration-guide

docs: add Tavily web search configuration guide

README.md

@@ -291,7 +291,7 @@ Technical details live in the `docs/` folder:
 
 - **[docs/ARCHITECTURE.md](docs/ARCHITECTURE.md)** — system design, module map, task layout, memory budget, protocols, flash partitions
 - **[docs/TODO.md](docs/TODO.md)** — feature gap tracker and roadmap
-- **[docs/im-integration/](docs/im-integration/README.md)** — IM channel integration guides (Feishu, etc.)
+- **[docs/tool-setup/](docs/tool-setup/README.md)** — configuration guides for external service integrations (Tavily, etc.)
 
 ## Contributing
 
@@ -315,10 +315,4 @@ Inspired by [OpenClaw](https://github.com/openclaw/openclaw) and [Nanobot](https
 
 ## Star History
 
-<a href="https://www.star-history.com/?repos=memovai%2Fmimiclaw&type=date&legend=top-left">
+[![Star History Chart](https://api.star-history.com/svg?repos=memovai/mimiclaw&type=Date)](https://star-history.com/#memovai/mimiclaw&Date)
- <picture>
-   <source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/image?repos=memovai/mimiclaw&type=date&theme=dark&legend=top-left" />
-   <source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/image?repos=memovai/mimiclaw&type=date&legend=top-left" />
-   <img alt="Star History Chart" src="https://api.star-history.com/image?repos=memovai/mimiclaw&type=date&legend=top-left" />
- </picture>
-</a>

docs/tool-setup/README.md

@@ -0,0 +1,20 @@
+# Tool Setup Guides
+
+Configuration guides for MimiClaw's external service integrations.
+
+## Guides
+
+| Guide | Service | Description |
+|-------|---------|-------------|
+| [Tavily Setup](TAVILY_SETUP.md) | [Tavily](https://tavily.com) | Web search API — preferred search provider for the `web_search` tool |
+
+## Overview
+
+MimiClaw integrates with external services to extend its capabilities. Each guide below walks through obtaining API credentials, configuring MimiClaw (build-time or runtime), and verifying the integration.
+
+All credentials can be set in two ways:
+
+1. **Build-time** — define in `main/mimi_secrets.h` and rebuild
+2. **Runtime** — use serial CLI commands (saved to NVS flash, no rebuild needed)
+
+See [mimi_secrets.h.example](../../main/mimi_secrets.h.example) for the full list of configurable secrets.

docs/tool-setup/TAVILY_SETUP.md

@@ -0,0 +1,224 @@
+# Tavily Web Search Configuration Guide
+
+<p align="center">
+  <img src="images/tavily-og.png" alt="Tavily - Search Engine for AI Agents" width="600" />
+</p>
+
+[Tavily](https://tavily.com) is a real-time search engine designed for AI agents and RAG workflows. MimiClaw uses Tavily as the **preferred** web search provider (with Brave Search as a fallback).
+
+## Table of Contents
+
+- [Overview](#overview)
+- [Getting an API Key](#getting-an-api-key)
+- [Configuring MimiClaw](#configuring-mimiclaw)
+- [How It Works in MimiClaw](#how-it-works-in-mimiclaw)
+- [API Details](#api-details)
+- [Pricing](#pricing)
+- [Rate Limits](#rate-limits)
+- [Troubleshooting](#troubleshooting)
+
+## Overview
+
+MimiClaw's `web_search` tool allows the AI agent to search the internet for real-time information. When a Tavily API key is configured, MimiClaw will use Tavily as the search provider. If no Tavily key is set but a Brave Search key exists, it falls back to Brave Search.
+
+**Why Tavily?**
+
+- Purpose-built for AI agents — returns clean, structured results
+- Includes relevance scoring for each result
+- Supports advanced search depth for higher quality results
+- 1,000 free API credits per month (no credit card required)
+
+## Getting an API Key
+
+1. **Sign up** at [app.tavily.com](https://app.tavily.com/home)
+2. **Create an account** — you can sign in with Google or email
+3. **Copy your API key** — it starts with `tvly-` and is available on the dashboard immediately
+4. The free **Researcher** plan gives you **1,000 API credits per month** with no credit card required
+
+Your API key will look like: `tvly-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx`
+
+## Configuring MimiClaw
+
+There are two ways to configure the Tavily API key:
+
+### Option 1: Build-time Configuration (Recommended for First Setup)
+
+1. Copy the secrets template if you haven't already:
+
+```bash
+cp main/mimi_secrets.h.example main/mimi_secrets.h
+```
+
+2. Edit `main/mimi_secrets.h` and set your Tavily key:
+
+```c
+#define MIMI_SECRET_TAVILY_KEY      "tvly-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+```
+
+3. Rebuild the firmware:
+
+```bash
+idf.py fullclean && idf.py build
+```
+
+4. Flash to your ESP32-S3:
+
+```bash
+idf.py -p PORT flash monitor
+```
+
+### Option 2: Runtime Configuration via Serial CLI
+
+Connect to the UART (COM) port and run:
+
+```
+mimi> set_tavily_key tvly-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+```
+
+This saves the key to NVS flash and takes effect immediately — no rebuild needed. Runtime values override build-time defaults.
+
+### Verify Configuration
+
+Check that the key is set:
+
+```
+mimi> config_show
+```
+
+You should see `tavily_key: tvly-****` (masked) in the output.
+
+## How It Works in MimiClaw
+
+When the AI agent needs to search the web, it calls the `web_search` tool. MimiClaw selects the search provider with this priority:
+
+```
+1. Tavily (if MIMI_SECRET_TAVILY_KEY is set)  <-- preferred
+2. Brave Search (if MIMI_SECRET_SEARCH_KEY is set)
+3. No search available (tool returns error)
+```
+
+The search flow:
+
+```
+User asks a question requiring web info
+        |
+        v
+Agent decides to call web_search tool
+        |
+        v
+MimiClaw sends POST to https://api.tavily.com/search
+  - Authorization: Bearer tvly-xxxxx
+  - Body: {"query": "...", "max_results": 5, "search_depth": "basic"}
+        |
+        v
+Tavily returns structured results
+        |
+        v
+Agent incorporates results into response
+```
+
+Each `basic` search costs **1 API credit**. With the free plan's 1,000 credits/month, that's about 33 searches per day.
+
+## API Details
+
+MimiClaw uses the Tavily Search API endpoint:
+
+| Parameter | Value |
+|-----------|-------|
+| **Endpoint** | `POST https://api.tavily.com/search` |
+| **Auth** | `Authorization: Bearer <API_KEY>` |
+| **Content-Type** | `application/json` |
+
+### Request Body (as sent by MimiClaw)
+
+| Field | Type | Value | Description |
+|-------|------|-------|-------------|
+| `query` | string | (from agent) | The search query |
+| `max_results` | integer | `5` | Number of results to return |
+| `search_depth` | string | `"basic"` | Search depth (`basic` = 1 credit) |
+
+### Response Fields
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `query` | string | The executed search query |
+| `results` | array | Ranked search results |
+| `results[].title` | string | Result title |
+| `results[].url` | string | Source URL |
+| `results[].content` | string | Summary snippet |
+| `results[].score` | float | Relevance score (0-1) |
+| `response_time` | float | Execution time in seconds |
+
+### HTTP Status Codes
+
+| Code | Meaning |
+|------|---------|
+| 200 | Success |
+| 400 | Bad Request — invalid parameters |
+| 401 | Unauthorized — missing or invalid API key |
+| 429 | Rate Limit — too many requests |
+| 432 | Plan Limit — monthly quota exceeded |
+| 500 | Server Error |
+
+## Pricing
+
+Tavily offers a generous free tier and several paid plans:
+
+| Plan | Monthly Credits | Cost | Per-Credit Rate |
+|------|-----------------|------|-----------------|
+| **Researcher** | 1,000 | **Free** | -- |
+| Project | 4,000 | $30 | $0.0075 |
+| Bootstrap | 15,000 | $100 | $0.0067 |
+| Startup | 38,000 | $220 | $0.0058 |
+| Growth | 100,000 | $500 | $0.005 |
+| Pay-as-you-go | Variable | $0.008/credit | $0.008 |
+
+**Credit costs per search:**
+
+- `basic` search depth: **1 credit**
+- `advanced` search depth: **2 credits**
+
+MimiClaw uses `basic` by default, so each search = 1 credit.
+
+## Rate Limits
+
+| Environment | Limit |
+|-------------|-------|
+| Development | 100 requests per minute |
+| Production | 1,000 requests per minute |
+
+For an ESP32-based agent, you will never hit these limits in practice.
+
+## Troubleshooting
+
+### "No search provider configured"
+
+The agent returns this when neither Tavily nor Brave Search keys are set.
+
+**Fix:** Set a Tavily API key via `set_tavily_key` CLI command or in `mimi_secrets.h`.
+
+### Search returns empty results
+
+- Verify your API key is correct: `config_show` should show `tavily_key: tvly-****`
+- Check your monthly credit balance at [app.tavily.com](https://app.tavily.com/home)
+- Ensure the ESP32 has internet access: `wifi_status`
+
+### HTTP 401 Unauthorized
+
+Your API key is invalid or expired. Generate a new one at [app.tavily.com](https://app.tavily.com/home).
+
+### HTTP 432 Plan Limit
+
+You've exceeded your monthly credit quota. Wait for the next billing cycle or upgrade your plan.
+
+### Search works but results are poor
+
+Tavily's `basic` search depth is optimized for speed. The quality is generally sufficient for an AI agent's needs. If you need higher quality, you can modify `SEARCH_RESULT_COUNT` in `tool_web_search.c`.
+
+## References
+
+- [Tavily Documentation](https://docs.tavily.com)
+- [Tavily API Reference](https://docs.tavily.com/documentation/api-reference/endpoint/search)
+- [Tavily API Credits](https://docs.tavily.com/documentation/api-credits)
+- [Tavily Rate Limits](https://docs.tavily.com/documentation/rate-limits)
+- [Tavily Playground](https://app.tavily.com/playground)