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

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

Terminal 2: Agentica Server

MUST run from its directory:

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

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

Health Checks

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:

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.

5. Timeout on agent.call()

Symptom: Call hangs for 30+ seconds then times out.

Cause: Claude CLI taking too long or stuck in a loop.

Fix: Check proxy logs for the actual CLI output. May need to simplify prompt.

Key Files

File Purpose

scripts/agentica/claude_proxy.py

OpenAI-compatible proxy with SSE streaming

workspace/agentica-research/agentica-server/

Local agentica-server installation

scripts/agentica/PATTERNS.md

Multi-agent pattern documentation

Quick Verification

Test the full stack:

1. Verify proxy responds

curl http://localhost:8080/health

2. Verify server responds

curl http://localhost:2345/health

3. Test inference through proxy

curl http://localhost:8080/v1/chat/completions
-H "Content-Type: application/json"
-d '{"model":"claude","messages":[{"role":"user","content":"Say hello"}]}'

Checklist

Before running agents:

• Claude proxy running on port 8080

• Agentica server running on port 2345 (from its directory)

• S_M_BASE_URL set for client scripts

• INFERENCE_ENDPOINT_URL set for server

• Both health checks return 200