W&B MCP Server for experiments and traces

Agent access to experiments and traces, with hosted deployment support, compatibility fixes, and usage instrumentation.

View repository
My role
Deployment, reliability, and telemetry contributor; launch-article coauthor
When
May 21, 2026
With
Weights & Biases · GitHub

Results

745K+

cumulative MCP tool calls

Owner-validated cumulative tool calls, not HTTP requests or sessions. Direct project usage, not revenue; review date is not a measurement cutoff.

direct · Owner-reviewed analytics · Owner-reviewed October 22, 2026 · as of 2026-10-22
1K+

MCP users across 1K+ organizations

Rounded launch-period adoption snapshot.

direct · Internal analytics · Launch period · as of 2026-06-11
More than two-thirds

of weekly active MCP users were returning users

Weekly active-user composition at the cited checkpoint.

direct · Internal analytics · Week of 2026-06-07 · as of 2026-06-11
Hundreds

of MCP users re-engaged in a week

Rounded weekly re-engagement checkpoint.

direct · Internal analytics · Week of 2026-07-20 · as of 2026-07-28
76%

growth in average weekly active identities in Multi Tenant Cloud

Average weekly active identities rose from 368.5 (April 19–May 16) to 649 (September 13–October 10), using consistent identity handling. Rounded growth; not unique people or growth attributable solely to one contributor.

direct · Owner-reviewed analytics · April 19–May 16 vs. September 13–October 10, 2026 · as of 2026-10-22
70%

active identities previously observed within the dashboard window

Of active identities in October 4–10, 70% appeared in an earlier observed week within the same dashboard window. Returning use, not cohort retention or verified repeat users.

direct · Owner-reviewed analytics · October 4–10, 2026 · as of 2026-10-22
≈4,800

cumulative recorded MCP identities

Approximately 4,800 identities ever recorded interacting with MCP. Identities are not verified distinct people; review date is not a measurement cutoff.

direct · Owner-reviewed analytics · Owner-reviewed October 22, 2026 · as of 2026-10-22
30

companies at the observed usage peak

Owner-validated company-level aggregate at an observed peak, not a current count, customer count, endorsement, or verified key-workflow adoption. Review date is not the peak date.

direct · Owner-reviewed analytics · Owner-reviewed October 22, 2026 · as of 2026-10-22
Talks, recordings, and code
  1. Oct 16, 2026Implementation

    release: v0.4.3

    Release contributor

    View pull request
  2. Sep 21, 2026Component

    feat(operator-wandb): ship the MCP 0.4 chart contract

    Contributor

    View pull request
  3. May 21, 2026Component

    Introducing the W&B MCP Server: An Agent-Native Interface for Your Experiments and Traces

    Coauthor with Nicolas Remerscheid

    Read article
  4. 2026Component

    Hosted MCP engineering contribution

    Engineering contributor

    Materials not public