experiment_item.create
Attach trace + datasetitem rows to an experiment.
How to use it
experiment_item.create is exposed by the Opik MCP MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the experiment_item.create tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.
Install Opik MCP
npx @modelcontextprotocol/inspector uvx opik-mcpOther tools in Opik MCP (15)
For investigative questions, cross-entity synthesis, or anything that needs
Attach a free-text comment to a trace, span, or thread.
Create an experiment scoped to a test suite.
Browse a collection with optional name filter and pagination. Project-scoped
Save a new prompt version (creates the prompt by name if missing).
One tool for any "show me X" question. Takes an entitytype plus an id
Run an evaluation experiment end-to-end via Ollie. Takes a single
Inspect the exact JSON shape and required fields of any write operation before
Attach a numeric feedback score to a trace, span, or thread.
Log a span on an existing trace (or a batch).
Upsert items into a test suite (always the envelope shape).
Create an evaluation test suite.
Log a single trace (or a batch). Parent for spans / scores / comments.
Finalize or amend an existing trace.
Universal write dispatcher. Pass operation + data and the dispatcher