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Litefuse·The Agent Observability and Evaluation Platform

Ship reliable AI agentswith evaluation-driven development

Langfuse SDK compatible·Lightweight architecture powered by Apache Doris·80% lower storage cost

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100k events/month · no credit card

Paste the prompt to configure Litefuse in AI native way for
Read https://litefuse.ai/SKILL.md and follow the instructions to install and configure Litefuse for Hermes Agent.
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01 · OBSERVABILITY
See every step your agent takes.
Nested traces for every LLM call, tool use, and subagent hop. Debug production with full input, output, cost, and latency.
02 · PROMPT MANAGEMENT
Manage prompts without touching code.
Version, label, and deploy prompts from the UI. Ship changes to production in seconds — no redeploy, no engineer required.
03 · EVALUATION
Measure quality. Catch regressions early.
LLM-as-judge, user feedback, custom metrics, and datasets. Run evals online on production traces or offline against test sets.
traces/b8f3a · code-review-agent1.24s · 7 observations
▾code-review-agentspan
1.24s
◆planclaude-3.5-sonnetgeneration
398ms
◆tool.read_filesrc/auth.tsspan
18ms
◆tool.grep"validateToken"span
12ms
▾subagent.security-reviewspan
612ms
◆analyzeclaude-3.5-haikugeneration
540ms
◆summarizeclaude-3.5-sonnetgeneration
204ms
prompts/code-review-agentv2.4 · production
Prompts
code-review-agent
review-summary
plan-generator
v2.4 production
v2.3 staging
v2.2
v2.1
v2.0
code-review-agentCHATv2.4
Diff v2.3Deploy →
system
You are an expert code reviewer focused on {{focus_areas}}. For the codebase at {{repo_path}}, flag findings by severity (P0, P1, P2) and cite file:line for every issue. Be direct — no praise-hedging.
user
Review this pull request:
{{diff}}
datasets/code-review-golden/runs128 items · 2 runs compared
dataset run comparison — llm-as-judge + custom metrics
v2.3 · baseline
pass rate
91.4%
avg judge score
4.50/5
hallucination rate
0.08
v2.4 · current
pass rate
94.2%▲ 2.8
avg judge score
4.62/5▲ 0.12
hallucination rate
0.03▼ 0.05
latency / cost
p50 latency
1.24s
p95 latency
3.87s
avg cost / run
$0.012
judge score · last 14 daysv2.3v2.4
Integrations

Plug into your entire AI stack.

Hermes Agent
Multi-agent orchestration visibility out of the box. See how specialist agents coordinate, where handoffs happen, what each costs.
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OpenClaw
Full session replay for autonomous coding agents. Debug why a run went off the rails — step by step, tool by tool.
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Claude Code
Trace every tool call, subagent, and hook with two lines of config. See your coding agent's full decision tree, end to end.
View docs
and everything else you already run
OpenAIAnthropicGoogle GeminiMistralAWS BedrockAzure OpenAIVercel AI SDKLangChainLangGraphLlamaIndexDSPyPydantic AISmolagentsCrewAIOpenAI Agents SDKLiteLLMInstructorMirascopeFlowiseLangflowTogether AIGroqFireworksOpenTelemetry
Explore 100+ more integrations →
Comparison

Forked from Langfuse.

More lightweight, cost-effective, and powerful.

Dimension
Langfuse
Litefuse
Services to deploy
6 — Web + Worker + Postgres + ClickHouse + Redis + MinIO
3 App + Postgres + Apache Doris
Storage cost (relative)
Baseline
~80% reduced, 10x free capacity
Built-in agent integrations
Baseline
Hermes Agent · OpenClaw · Claude Code
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Fast full-text search via inverted index

Start shipping reliable AI agents with Litefuse.

100k events/month · no credit card · 5 minutes to your first trace

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