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Langfuse (BYOK)

Read your Langfuse observations, scores, prompts, datasets, experiments, models and metrics (EU cloud region) with your own project API keys

Unify Dynamics LLC

Tools12read-only
Sign-inBYOKbring your own key
Key keptNeverused for one call only
PriceFreeoptional Pro limits
ProviderLangfuseunofficial, not affiliated
Works withMCP · RESTany agent

Try asking

Real questions, and the tools your agent calls to answer them.

Which Langfuse project do my keys belong to?
Tools called
get_project
Show the most expensive Langfuse generations from the last day
Tools called
list_observations
What evaluation scores named 'helpfulness' were recorded in Langfuse?
Tools called
list_scores
What model prices does my Langfuse project use?
Tools called
list_models
Show the Langfuse model definition clm1abc
Tools called
get_model
Which prompts are labelled production in Langfuse?
Tools called
list_prompts

About

Langfuse (BYOK) lets an AI assistant read your own Langfuse data through the Langfuse API with a key you supply (Langfuse public key (starts with pk-lf-)). Read-only: 12 tools (get_project, list_observations, list_scores, list_models, get_model, list_prompts, get_prompt, list_datasets, list_dataset_items, list_score_configs, list_experiments, query_metrics). The BYOK key travels with each request, is used for that one call only and is never stored, logged or cached; it is only ever sent to cloud.langfuse.com. Unofficial connector by Unify Dynamics LLC: not affiliated with, endorsed by or sponsored by Langfuse. Langfuse and its logos are trademarks of their owners and are used only to say which service the connector works with.

Sources: Live from the Langfuse API (cloud.langfuse.com) with a BYOK key; documentation: https://cloud.langfuse.com/generated/api/openapi.yml. Endpoints checked against that documentation on 2026-10-16.

Privacy

The publisher, Unify Dynamics LLC, states that tool inputs are processed in memory and not retained.

Data not collectedNo account, no profile, no stored prompts or results.

What it can do

12 tools, grouped by job. Every one is read-only or compute-only.

OpenAPI
Read your data12 tools
  • Get projectShow the Langfuse project the keys belong to: id, name, organization and data retention days.
  • List observationsList observations (generations, spans, events) newest first with type, name, model, latency, token usage, cost and trace id.
  • List scoresList scores (evaluations and user feedback) with name, value, source, data type and the trace, observation or session they belong to.
  • List modelsList the models Langfuse knows for cost calculation with match pattern, unit and input, output and total price.
  • Get modelGet one model definition by id with its prices and pricing tiers.
  • List promptsList prompts with type, versions, labels, tags and last update.
  • Get promptGet one prompt version: its text or chat messages, config, labels, tags and commit message.
  • List datasetsList datasets with description, schemas and creation and update times.
  • List dataset itemsList dataset items with input, expected output, status and the trace they came from.
  • List score configsList score configurations with name, data type, value range, categories and archived state.
  • List experimentsList experiments (dataset runs) that had events since a start time, with item count, dataset and time range.
  • Query metricsAggregate observation or score data with Langfuse's metrics query, for example cost by model per day.

Information

PublisherUnify Dynamics LLC
CategoryDeveloper tools
LanguagesEnglish
Built forWorldwide
CompatibilityAny MCP client · any agent · REST
Version0.1.0
MCP endpointhttps://byok-langfuse.connectorbay.com/mcp
REST APIopenapi.json
SupportGet help · Status
CountryWorldwide
FunctionOther
LayerDeep connectors

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Get Langfuse (BYOK)

Free · BYOK · Read-only

BYOK: bring your own keyThis connector uses your own Langfuse Langfuse public key (starts with pk-lf-). Create one at https://cloud.langfuse.com, with the fewest permissions it needs (read-only if the provider offers it). Your assistant sends it in the X-Upstream-Key header with every request. It is used for that one call only: never stored, logged or cached, and only ever sent to Langfuse. Revoke it at the provider whenever you like. Unofficial connector: not affiliated with Langfuse.