Agentmetry
Free · Open source
SOC and DevSecOps teams
Agent debugging without full trajectory capture is guesswork — you see the final output, not the five tool calls and two LLM hops that produced it. PandaProbe instruments those paths from the first line of startup code and scores them with evaluation metrics built for sessions that run longer than a single prompt-response cycle.
$29/month · Free tier: 100 base trace ingestion / mo, 100 trace eval runs / mo, 10 session eval runs / mo, Human annotation, 1 seat, Community support via GitHub · Checked Jul 1, 2026
The core loop is trace, eval, monitor: capture every span across a session, run research-grounded scoring against those traces, then schedule that scoring on a cron so regressions surface before users do. One-line instrumentation covers LangGraph, CrewAI, Google ADK, OpenAI Agents SDK, and others — so you are not writing custom middleware to get signal. The session-level evaluation is the differentiator; most observability tooling scores individual calls, not the drift that accumulates across a 40-step agent trajectory. Self-hosted deployment is available under Apache 2.0, which matters for teams whose data cannot leave their infrastructure. The free tier caps trace ingestion and session eval runs at counts that support experimentation but not sustained production load.
Bottom line: PandaProbe earns its place on a team instrumenting a multi-framework agent stack that needs trajectory-level evals and behavioral drift detection — but teams running high-volume production traffic will hit the session eval run ceiling on paid tiers and need to negotiate enterprise limits or architect around the quotas.
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Open Source Self-host all core PandaProbe features for free without any limitations.
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More options in LLM Observability. Compare pricing, platforms, and features side by side.
Free · Open source
SOC and DevSecOps teams
Freemium
Developers building GenAI apps and agents
Most agent observability tools treat a session as a bag of individual spans. PandaProbe treats it as a trajectory — an ordered sequence of tool calls, LLM hops, and decision branches that only makes sense scored end-to-end. The workflow is: instrument once at startup using a framework-specific adapter, collect full session traces with spans and metadata captured automatically, then run eval jobs that score those traces with metrics designed to detect uncertainty accumulation and behavioral drift across long-running sessions. Results feed a monitoring layer where you set regression thresholds and alert schedules.
The session-level evaluation metrics are the architectural bet PandaProbe makes that most competitors do not. The vendor describes these as research-grounded, purpose-built for long agent lifecycles — the goal being to catch where an agent’s confidence degrades over many steps, not just flag a bad individual call. LLM-as-judge scoring returns structured, actionable feedback rather than a raw score, so the output of an eval run points at a specific span rather than returning a number you have to interpret yourself.
PandaProbe fits teams actively iterating on agents across frameworks — the integration list covers LangGraph, LangChain, CrewAI, Google ADK, Claude Agent SDK, OpenAI Agents SDK, and DeepAgents, with model provider support spanning OpenAI, Anthropic, Gemini, Mistral, and AWS Bedrock. It also ships a CLI and a SKILL.md file designed so coding agents like Claude Code, Cursor, or Codex can manage traces and eval runs through natural language commands — meaning the tool can wire itself into an AI-assisted development loop without manual dashboard interaction. Where it breaks is volume: session eval run quotas enforce a ceiling on how many full-trajectory evaluations you can run per month at each tier, and teams running continuous evals against high-traffic production agents will exhaust those quotas and face either overage costs or architectural compromises.
Self-hosting is available under Apache 2.0 and is listed as a first-class deployment path, not an afterthought. The CLI exposes full API access for CI/CD scripting, and the Python SDK handles custom instrumentation for stacks not covered by the named framework adapters. Human annotation is available starting on the free tier, which is an unusual inclusion — it allows teams to blend automated scoring with manual labeling without moving to a paid seat immediately.
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