pisama-agent-sdk 0.1.2

Claude Agent SDK integration for Pisama detection - real-time failure prevention via hooks

pisama-agent-sdk

Real-time failure detection hooks for the Claude Agent SDK. Catches infinite loops, hallucinations, and other failure modes before they cause damage.

Part of the Pisama platform for multi-agent failure detection.

Install

pip install pisama-agent-sdk

Quick Start

Passive Monitoring (hooks)

Add two lines to your Claude Agent SDK setup:

from pisama_agent_sdk import pre_tool_use_hook, post_tool_use_hook

agent.hooks.pre_tool_use = pre_tool_use_hook
agent.hooks.post_tool_use = post_tool_use_hook

Every tool call is now checked for failure patterns in real-time (<100ms). If a loop or other issue is detected, the hook returns a blocking signal to stop the agent.

Active Self-Check

Let the agent verify its own output:

from pisama_agent_sdk import check

result = await check(
    output="The server is healthy based on the metrics.",
    context={"query": "Is auth-service down?", "sources": [...]},
)
if not result["passed"]:
    # result["issues"] describes what went wrong
    print(result["issues"])

Custom Tool for Claude Agent SDK

Give the agent a tool it can call to self-check:

from pisama_agent_sdk import create_check_tool
from claude_agent_sdk import ClaudeAgentOptions

options = ClaudeAgentOptions(
    custom_tools=[create_check_tool()],
)

Configuration

from pisama_agent_sdk import configure_bridge, BridgeConfig

configure_bridge(BridgeConfig(
    fail_open=True,           # Allow execution if detection errors (default: True)
    detection_timeout_ms=80,  # Max detection time per hook (default: 80)
))

Tool Matchers

Control which tools get checked:

from pisama_agent_sdk import PreToolUseHook, create_matcher, FILE_TOOLS, SHELL_TOOLS

# Only check file and shell tools
hook = PreToolUseHook(matcher=create_matcher(include=[FILE_TOOLS, SHELL_TOOLS]))
agent.hooks.pre_tool_use = hook

Built-in matchers: ALL_TOOLS, FILE_TOOLS, SHELL_TOOLS, DANGEROUS_COMMANDS, AGENT_TOOLS.

How It Works

1. Your agent makes a tool call
2. pre_tool_use_hook converts the call into a Pisama Span
3. Registered detectors run against the span + recent session context
4. If a failure is detected (e.g., 5th consecutive Read of the same file), the hook returns a blocking result
5. The agent receives the block signal and adjusts its behavior

Detection runs entirely locally using pisama-core detectors. No network calls unless you configure a remote endpoint.

Evaluator Mode

Use Pisama as an evaluator in multi-agent harnesses:

from pisama_agent_sdk import PisamaEvaluator

evaluator = PisamaEvaluator(endpoint="https://your-pisama-instance/api/v1")
result = await evaluator.evaluate(trace_data)
print(result.passed, result.failures)

Requires pip install pisama-agent-sdk[evaluator].

License

MIT