Local-first agent debugger with replay, failure memory, smart highlights, and drift detection.

pip install peaky-peek-server && peaky-peek --open

Local-first, open-source agent debugger. Capture decisions, replay from checkpoints, visualize reasoning trees — all on your machine, no data sent anywhere.

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Why Peaky Peek?

Traditional observability tools weren't built for agent-native debugging:

Tool	Focus	Problem
LangSmith	LLM tracing	SaaS-first, your data leaves your machine
OpenTelemetry	Infra metrics	Blind to reasoning chains and decision trees
Sentry	Error tracking	No insight into why agents chose specific actions
Peaky Peek	Agent-native debugging	Local-first, open source, privacy by default

Peaky Peek captures the causal chain behind every action so you can debug agents like distributed systems: trace failures, replay from checkpoints, and search across reasoning paths.

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Quick Start

Option 1: Decorator (simplest)

pip install peaky-peek-server
peaky-peek --open   # launches API + UI at http://localhost:8000

from agent_debugger_sdk import trace

@trace
async def my_agent(prompt: str) -> str:
    # Your agent logic here — traces are captured automatically
    return await llm_call(prompt)

Option 2: Context Manager

from agent_debugger_sdk import trace_session

async with trace_session("weather_agent") as ctx:
    await ctx.record_decision(
        reasoning="User asked for weather",
        confidence=0.9,
        chosen_action="call_weather_api",
        evidence=[{"source": "user_input", "content": "What's the weather?"}],
    )
    await ctx.record_tool_call("weather_api", {"city": "Seattle"})
    await ctx.record_tool_result("weather_api", result={"temp": 52, "forecast": "rain"})

Option 3: Zero-Config Auto-Patch (no code changes)

# Set env var, then run your agent normally
PEAKY_PEEK_AUTO_PATCH=true python my_agent.py

Works with PydanticAI, LangChain, OpenAI SDK, CrewAI, AutoGen, LlamaIndex, and Anthropic — no imports or decorators needed.

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Framework Integrations

PydanticAI

from pydantic_ai import Agent
from agent_debugger_sdk import init
from agent_debugger_sdk.adapters import PydanticAIAdapter

init()

agent = Agent("openai:gpt-4o")
adapter = PydanticAIAdapter(agent, agent_name="support_agent")

LangChain

from agent_debugger_sdk import init
from agent_debugger_sdk.adapters import LangChainTracingHandler

init()

handler = LangChainTracingHandler(session_id="my-session")
# Pass handler to your LangChain agent's callbacks

OpenAI SDK

No code needed — just set the environment variable:

PEAKY_PEEK_AUTO_PATCH=true python my_openai_agent.py

Or use the simplified decorator:

from agent_debugger_sdk import trace

@trace(name="openai_agent", framework="openai")
async def my_agent(prompt: str) -> str:
    client = openai.AsyncOpenAI()
    response = await client.chat.completions.create(
        model="gpt-4o", messages=[{"role": "user", "content": prompt}]
    )
    return response.choices[0].message.content

Auto-Patch (Any Framework)

import agent_debugger_sdk.auto_patch  # activates on import when PEAKY_PEEK_AUTO_PATCH is set

# Now run your agent normally — all LLM calls are traced automatically

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Features

Decision Tree Visualization

Navigate agent reasoning as an interactive tree. Click nodes to inspect events, zoom to explore complex flows, and trace the causal chain from policy to tool call to safety check.

Checkpoint Replay

Time-travel through agent execution with checkpoint-aware playback. Play, pause, step, and seek to any point in the trace. Checkpoints are ranked by restore value so you jump to the most useful state.

Trace Search

Find specific events across all sessions. Search by keyword, filter by event type, and jump directly to results.

Failure Clustering & Multi-Agent Coordination

Adaptive analysis groups similar failures. Inspect planner/critic debates, speaker topology, and prompt policy parameters across multi-agent systems.

Session Comparison

Compare two agent runs side-by-side. See diffs in turn count, speaker topology, policies, stance shifts, and grounded decisions.

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Privacy & Security

• Local-first by default — no external telemetry, no data leaves your machine
• Zero-config auto-patching — no credentials or API keys needed for local debugging
• Optional redaction pipeline — prompts, payloads, PII regex
• API key authentication — bcrypt hashing
• GDPR/HIPAA friendly — SQLite storage, no cloud dependency

Deployment

pip (recommended)

pip install peaky-peek-server
peaky-peek --open

Docker

docker build -t peaky-peek .
docker run -p 8000:8000 -v ./traces:/app/traces peaky-peek

Development

git clone https://github.com/acailic/agent_debugger
cd agent_debugger
pip install -e ".[dev]"
pip install fastapi "uvicorn[standard]" "sqlalchemy[asyncio]" aiosqlite alembic aiofiles bcrypt
python3 -m pytest -q
cd frontend && npm install && npm run build

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Architecture

System Overview

flowchart TB
    classDef layer fill:#0f172a,stroke:#334155,color:#e2e8f0,stroke-width:2px
    classDef ext fill:none,stroke:#94a3b8,stroke-dasharray:6 3,color:#94a3b8

    AGENT("🤖  Your Agent Code"):::ext

    subgraph RUNTIME[" "]
        direction TB
        SDK["<b>🔌  SDK Layer</b><br/><small>Instrument & capture</small><br/><sub>@trace · TraceContext · Auto-Patch · Adapters</sub>"]:::layer
        INTEL["<b>🧠  Intelligence</b><br/><small>Detect, remember, alert</small><br/><sub>Event Buffer · Pattern Detector · Failure Memory · Replay Engine</sub>"]:::layer
    end

    subgraph SERVER[" "]
        direction TB
        API["<b>🌐  API Server</b><br/><small>FastAPI + SSE</small><br/><sub>11 routers: sessions · traces · replay · search · analytics · compare</sub>"]:::layer
        STORE["<b>💾  Storage</b><br/><small>SQLite WAL · async</small><br/><sub>Events · Checkpoints · Analytics · Embeddings</sub>"]:::layer
    end

    UI["<b>🖥️  Frontend</b><br/><small>React · TypeScript · Vite</small><br/><sub>8 panels: decision tree · timeline · tools · replay · search · analytics · compare · live</sub>"]:::layer

    AGENT ==>|"decorate"| SDK
    SDK ==>|"emit"| INTEL
    INTEL -->|"persist"| STORE
    SDK -.->|"ingest"| API
    API <-->|"query"| STORE
    API ==>|"SSE stream"| UI
    INTEL -.->|"replay"| API

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Layer Detail

flowchart LR
    classDef sdk fill:#4f46e5,stroke:#3730a3,color:#fff,stroke-width:2px
    classDef intel fill:#dc2626,stroke:#b91c1c,color:#fff,stroke-width:2px
    classDef api fill:#059669,stroke:#047857,color:#fff,stroke-width:2px
    classDef store fill:#b45309,stroke:#92400e,color:#fff,stroke-width:2px
    classDef ui fill:#7c3aed,stroke:#6d28d9,color:#fff,stroke-width:2px

    subgraph SDK[" 🔌  SDK "]
        direction TB
        DEC["@trace decorator"]:::sdk
        CTX["TraceContext"]:::sdk
        AP["Auto-Patch"]:::sdk
        AD["Framework Adapters"]:::sdk
    end

    subgraph INT[" 🧠  Intelligence "]
        direction TB
        BUF["Event Buffer"]:::intel
        PAT["Pattern Detector"]:::intel
        FMEM["Failure Memory"]:::intel
        ALERT["Alert Engine"]:::intel
        RPLAY["Replay Engine"]:::intel
    end

    subgraph APIL[" 🌐  API "]
        direction TB
        R1["Sessions · Traces"]:::api
        R2["Replay · Search"]:::api
        R3["Analytics · Compare"]:::api
        SSE["SSE Stream"]:::api
    end

    subgraph STO[" 💾  Storage "]
        direction TB
        DB[("SQLite WAL")]:::store
        S1["Events · Checkpoints"]:::store
        S2["Analytics Aggregations"]:::store
    end

    subgraph UIF[" 🖥️  Frontend "]
        direction TB
        DT["Decision Tree"]:::ui
        TL["Trace Timeline"]:::ui
        TI["Tool Inspector"]:::ui
        RP["Session Replay"]:::ui
        SE["Cross-session Search"]:::ui
        AN["Analytics Dashboard"]:::ui
    end

    DEC & CTX --> BUF
    AP & AD --> BUF
    BUF --> PAT & FMEM & ALERT
    BUF --> S1
    S1 --> DB
    DB --> S2
    R1 & R2 & R3 <--> S1
    RPLAY --> R2
    SSE --> DT & TL & RP

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See ARCHITECTURE.md for full module breakdown.

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Project Status

• Core debugger — local path end-to-end, stable
• SDK — @trace, trace_session(), auto-patch for 7 frameworks
• API — 11 routers: sessions, traces, replay, search, analytics, cost, comparison
• Frontend — 8 specialized panels (decision tree, replay, checkpoints, search)
• Tests — 365+ passing, CI on Python 3.10/3.11/3.12

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Scientific Foundations

Peaky Peek is informed by research on agent debugging, causal tracing, failure analysis, and adaptive replay. See paper notes for design takeaways from each.

• AgentTrace: Causal Graph Tracing for Root Cause Analysis
• XAI for Coding Agent Failures
• FailureMem: Failure-Aware Autonomous Software Repair
• MSSR: Memory-Aware Adaptive Replay
• Learning When to Act or Refuse
• Policy-Parameterized Prompts
• CXReasonAgent: Evidence-Grounded Diagnostic Reasoning
• NeuroSkill: Proactive Real-Time Agentic System
• REST: Receding Horizon Explorative Steiner Tree
• Towards a Neural Debugger for Python

Documentation

• 5-Minute Getting Started
• Integration Guide
• SDK README
• Architecture Overview
• Progress Tracker

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Contributing

Contributions are welcome! See CONTRIBUTING.md for guidelines.

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License

MIT