LangChain

The BlueRock runtime provides native, out-of-the-box telemetry tracing for the LangChain ecosystem. By embedding the bluerock sensor directly into the execution space, BlueRock automatically hooks into LangChain's internal orchestration engines without requiring architectural changes to the codebase or manual analytics callbacks.

Core Architecture

Environment Setup

1. Provision the Isolated Project Environment Initialize the local configuration layout with uv to ensure strict, repeatable dependency management across testing environments:

   # Initialize clean project workspace
   $ uv init --python python3.13 sample_agent
   $ cd sample_agent
   
   # Activate virtual runtime environment
   $ source .venv/bin/activate
   
   # (Optional) Append required core modules
   $ uv add <module-names>

2. Inject and Register BlueRock Sensors Deploy the custom BlueRock telemetry sensor library directly within the activated workspace context:

   # Perform localized wheel installation
   $ uv pip install /opt/bluerock/python-dist/bluerock-0.0.1*.whl
   
   # Activate runtime sensor hooks
   $ python -m bluerock --install

3. Establish the Associated Tool Layer (MCP Sandbox) Launch the isolated Model Context Protocol tool container, ensuring the container bridges telemetry hooks securely using a shared socket mount configuration:

   $ docker run --name mcp_fileserver \
     --rm \
     -d \
     -v /run/bluerock:/run/bluerock \
     -p 8001:8001 \
     mcp_fileserver:latest

Agent Execution Block

Create the localized controller file as file_agent.py to initiate runtime actions. Ensure appropriate authorization environment variables (OPENAI_API_KEY) are bound to the parent terminal session:

# Execute target LangChain workspace script
$ uv run sample_agent.py  

Captured OpenTelemetry (OTEL) Lifecycle Events

During validation phases, the active bluepython sensor writes structured payloads tracking the progression of agent execution states.

Phase 1: Chain Initialization (chain_start)

Triggers at the point of boundary entry, registering raw intent values before prompt parsing steps.

{
    "body": {
        "chain_type": "unknown",
        "context": { "process": { "pid": 000000 } },
        "entity_id": "xxxxxxxx-0000-0xxx-xxxx-000000xxxxxx",
        "event": "chain_start",
        "inputs": {
            "messages": "[('human', \"What files do I have, and can you add a 'README.md' to the list?. Also remove any tmp file present?\")]"
        },
        "run_id": "00000xx0-00xx-0xxx-0000-0xxx00xxxx00"
    },
    "severity_number": 0,
    "severity_text": "INFO",
    "attributes": {
        "domain": "gyro",
        "event_name": "python_langchain_event",
        "origin": "bluepython",
        "sensor_id": 0000,
        "type": "event"
    },
    "scope": { "name": "bluerockd" },
    "resource": { "service.name": "bluerock" }
}

Phase 2: System & Context Compilation (llm_start)

Logs model requests immediately after prompt construction, revealing state tracking injected by MCP adapters (TextResourceContents derived from the file server mount).

{
    "body": {
        "context": { "process": { "pid": 000000 } },
        "entity_id": "xxxxxxxx-0000-0xxx-xxxx-000000xxxxxx",
        "event": "llm_start",
        "model": "ChatOpenAI",
        "prompts": [
            "System: You are a file manager. Current files: [TextResourceContents(uri=AnyUrl('folder://explorer'), mimeType='text/plain', text='sample.txt\\ntestfile.tmp')]\nHuman: What files do I have, and can you add a 'README.md' to the list?. Also remove any tmp file present?"
        ],
        "run_id": "00000xx0-00xx-0000-000b-00f0xxxx0000"
    },
    "severity_number": 0,
    "severity_text": "INFO",
    "attributes": {
        "domain": "gyro",
        "event_name": "python_langchain_event",
        "origin": "bluepython",
        "sensor_id": 0000
    }
}

Phase 3: Structural Action Interception (tool_start / tool_end)

Captures downstream execution tasks, auditing intent values and programmatic outputs before mutation phases proceed.

Invocation Trace (tool_start):

{
    "body": {
        "context": { "process": { "pid": 000000 } },
        "entity_id": "xxxxxxxx-0000-0xxx-xxxx-000000xxxxxx",
        "event": "tool_start",
        "run_id": "00000xx0-0xxx-0xx0-0c00-00b00000xx0d",
        "tool_input": "{'filename': 'README.md', 'content': '# Project Documentation\\n\\nThis is the README file for the project.'}",
        "tool_name": "write_file"
    },
    "severity_number": 0,
    "severity_text": "INFO",
    "attributes": {
        "event_name": "python_langchain_event",
        "origin": "bluepython"
    }
}

• Resolution Trace (tool_end):

{
    "body": {
        "context": { "process": { "pid": 000000 } },
        "entity_id": "xxxxxxxx-0000-0xxx-xxxx-000000xxxxxx",
        "event": "tool_end",
        "run_id": "00000xx0-0xxx-0xx0-0c00-00b00000xx0d",
        "tool_output": "content=[{'type': 'text', 'text': \"File 'README.md' written successfully.\"}] name='write_file' artifact={'structured_content': {'result': \"File 'README.md' written successfully.\"}}"
    },
    "severity_number": 0,
    "severity_text": "INFO",
    "attributes": {
        "event_name": "python_langchain_event",
        "origin": "bluepython"
    }
}

Phase 4: Resolution Convergence (chain_end)

Marks terminal parsing completion steps, mapping execution-wide performance metadata (including provider footprints, resource token counts, and internal fingerprint registers).

{
    "body": {
        "context": { "process": { "pid": 000000 } },
        "entity_id": "xxxxxxxx-0000-0xxx-xxxx-000000xxxxxx",
        "event": "chain_end",
        "outputs": {
            "messages": "[... Tool Response Convergence Output ...]",
            "response_metadata": {
                "token_usage": { "completion_tokens": 00, "prompt_tokens": 000, "total_tokens": 000 },
                "model_provider": "openai",
                "model_name": "gpt-4o",
                "finish_reason": "tool_calls"
            }
        },
        "run_id": "00000xx0-00xx-0xxx-0000-0xxx00xxxx00"
    },
    "severity_number": 0,
    "severity_text": "INFO",
    "attributes": {
        "domain": "gyro",
        "event_name": "python_langchain_event",
        "origin": "bluepython"
    }
}