pisama-core 1.4.0

Core detection, scoring, and healing engine for Pisama agent forensics

pisama-core

Detection, scoring, and healing engine for AI agent systems. Detect failure modes like infinite loops, hallucinations, cost overruns, and coordination breakdowns in your LLM agents -- entirely offline, no API keys required.

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

Install

pip install pisama-core

Quick Start

import asyncio
from pisama_core import Trace, SpanKind, DetectionOrchestrator

# Build a trace from your agent's execution
trace = Trace()
for i in range(8):
    trace.create_span(name="Read", kind=SpanKind.TOOL)

# Run all built-in detectors
orchestrator = DetectionOrchestrator()
result = asyncio.run(orchestrator.analyze(trace))

for detection in result.detections:
    print(f"[{detection.detector_name}] {detection.summary}")
    print(f"  Severity: {detection.severity}/100")
    print(f"  Fix: {detection.fix_recommendation.instruction}")

Output:

[loop] Tool 'Read' repeated 8x consecutively
  Severity: 45/100
  Fix: Stop the current loop. Try a different approach or ask the user for guidance.

No API key. No network calls. Runs completely locally.

Built-in Detectors

Detector	What it catches
Loop	Consecutive repetitions, cyclic patterns (A->B->A->B), low tool diversity
Repetition	Similar actions with slight variations, tool dominance
Cost	Token budget overruns, excessive LLM/tool calls
Hallucination	Failed file operations, error rate spikes
Coordination	Message storms, agent imbalance, handoff loops

All detectors support both batch analysis (full trace) and real-time hooks (per-span).

Use Individual Detectors

import asyncio
from pisama_core import Trace, SpanKind
from pisama_core.detection.detectors.loop import LoopDetector
from pisama_core.detection.detectors.cost import CostDetector

trace = Trace()
# ... add spans representing your agent's execution

loop = LoopDetector()
cost = CostDetector()

loop_result = asyncio.run(loop.detect(trace))
cost_result = asyncio.run(cost.detect(trace))

if loop_result.detected:
    print(f"Loop detected: {loop_result.summary}")

Write Your Own Detector

from pisama_core import BaseDetector, DetectionResult, Trace
from pisama_core.detection.result import FixType

class MyDetector(BaseDetector):
    name = "my_detector"
    description = "Detects my custom failure pattern"
    version = "0.1.0"

    async def detect(self, trace: Trace) -> DetectionResult:
        # Your detection logic here
        tool_names = trace.get_tool_sequence()
        if len(set(tool_names)) == 1 and len(tool_names) > 5:
            return DetectionResult.issue_found(
                detector_name=self.name,
                severity=50,
                summary="Agent is stuck using a single tool",
                fix_type=FixType.SWITCH_STRATEGY,
                fix_instruction="Try a different approach",
            )
        return DetectionResult.no_issue(self.name)

Register it so the orchestrator picks it up:

from pisama_core import registry
registry.register(MyDetector())

Core Concepts

• Trace -- A complete agent execution session containing multiple spans
• Span -- A single unit of work (tool call, LLM inference, agent turn) with kind, timing, and optional I/O data
• DetectionResult -- Detector output: issue found (yes/no), severity (0-100), evidence, fix recommendation
• DetectorRegistry -- Plugin system for registering detectors (built-ins auto-register on import)
• DetectionOrchestrator -- Runs all registered detectors and aggregates results

Platform Support

Traces are framework-agnostic. Set platform for platform-aware threshold tuning:

from pisama_core import Trace, TraceMetadata, Platform

trace = Trace(metadata=TraceMetadata(platform=Platform.LANGGRAPH))

Works with Claude Agent SDK, LangGraph, AutoGen, CrewAI, n8n, Dify, and custom agents.

Pisama Platform

For production monitoring with 25+ calibrated detectors, ML-based detection, LLM-as-judge verification, and a dashboard, see pisama.ai.

License

MIT