agentica-server

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• SKILL.md

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# Agentica Server + Claude Proxy Setup

Complete reference for running Agentica SDK with a local Claude proxy. This enables Python agents to use Claude CLI as their inference backend.

## When to Use

Use this skill when:
- Starting Agentica development with Claude proxy
- Debugging connection issues between SDK, server, and proxy
- Setting up a fresh Agentica environment
- Troubleshooting agent tool access or hallucination issues

## Architecture

```
Agentica SDK (client code)
    | S_M_BASE_URL=http://localhost:2345
    v
ClientSessionManager
    |
    v
Agentica Server (agentica-server)
    | INFERENCE_ENDPOINT_URL=http://localhost:8080/v1/chat/completions
    v
Claude Proxy (claude_proxy.py)
    |
    v
Claude CLI (claude -p)
```

## Environment Variables

| Variable | Set By | Used By | Purpose |
|----------|--------|---------|---------|
| `INFERENCE_ENDPOINT_URL` | Human | agentica-server | Where server sends LLM inference requests |
| `S_M_BASE_URL` | Human | Agentica SDK client | Where SDK connects to session manager |

**KEY:** These are NOT the same endpoint!
- SDK connects to server (port 2345)
- Server connects to proxy (port 8080)

## Startup Sequence

Must start in this order (each in a separate terminal):

### Terminal 1: Claude Proxy

```bash
uv run python scripts/agentica/claude_proxy.py --port 8080
```

### Terminal 2: Agentica Server

**MUST run from its directory:**

```bash
cd workspace/agentica-research/agentica-server
INFERENCE_ENDPOINT_URL=http://localhost:8080/v1/chat/completions uv run agentica-server --port 2345
```

### Terminal 3: Your Agent Script

```bash
S_M_BASE_URL=http://localhost:2345 uv run python scripts/agentica/your_script.py
```

## Health Checks

```bash
# Claude proxy health
curl http://localhost:8080/health

# Agentica server health
curl http://localhost:2345/health
```

## Common Errors & Fixes

### 1. APIConnectionError after agent spawn

**Symptom:** Agent spawns successfully but fails on first call with connection error.

**Cause:** Claude proxy returning plain JSON instead of SSE format.

**Fix:** Proxy must return Server-Sent Events format:
```
data: {"choices": [...]}\n\n
```

### 2. ModuleNotFoundError for agentica-server

**Symptom:** `ModuleNotFoundError: No module named 'agentica_server'`

**Cause:** Running `uv run agentica-server` from wrong directory.

**Fix:** Must `cd workspace/agentica-research/agentica-server` first.

### 3. Agent can't use Read/Write/Edit tools

**Symptom:** Agent asks for file contents instead of reading them.

**Cause:** Missing `--allowedTools` in claude_proxy.py CLI call.

**Fix:** Proxy must pass tool permissions:
```bash
claude -p ... --allowedTools Read Write Edit Bash
```

### 4. Agent claims success but didn't do task

**Symptom:** Agent says "I've created the file" but file doesn't exist.

**Cause:** Hallucination - agent describing intended actions without executing.

**Fix:** Added emphatic anti-hallucination prompt in REPL_BASELINE:
```
CRITICAL: Use ACTUAL tools. Never DESCRIBE using tools.
```

From rubicanjr/FinCognis, MIT.

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