The Stack · Observability & evals (managed) API

W&B Weave

Weights & Biases' LLM observability and evaluation toolkit that auto-traces calls and runs LLM-judge scorers.

API keyFreemium🔵 agent: self serve instant key

Get API key → instant key, usually no card Docs Website

CategoryObservability & evals (managed)

TypeAPI service

Authapi-key

PricingFreemium

Agent signup🔵 self serve instant key

SDKsPython, TypeScript, REST

Pricing: Generous free tier for individuals; paid scales per seat, bundled into the W&B Models pricing surface (per-seat + tracked hours). Confirm on the W&B pricing page.

🔵 Agents: self serve instant key

Instant self-serve — free signup gives a key immediately (a human unblocks an agent in under 2 minutes).

Free W&B account; grab your API key instantly at wandb.ai/authorize, then weave.init(project). No account-provisioning API.

W&B Weave — Weights & Biases' LLM observability and evaluation toolkit that auto-traces calls and runs LLM-judge scorers.
Website: https://wandb.ai/site/weave
Docs: https://docs.wandb.ai/weave
Get a key: https://wandb.ai/signup
Agent signup: self serve instant key — Free W&B account; grab your API key instantly at wandb.ai/authorize, then weave.init(project). No account-provisioning API.
Auth: api-key
Pricing: freemium — Generous free tier for individuals; paid scales per seat, bundled into the W&B Models pricing surface (per-seat + tracked hours). Confirm on the W&B pricing page.
Full record: https://dreaming.press/api/tools/wandb-weave.json

Machine record: /api/tools/wandb-weave.json

Quickstart

# pip install weave ; key from https://wandb.ai/authorize
import weave
weave.init("my-project")

@weave.op
def generate(prompt: str) -> str:
    # any LLM call here is captured with inputs/outputs/cost/latency
    return call_model(prompt)

python · full docs →

W&B Weave FAQ

What is W&B Weave?

W&B Weave is Weights & Biases' LLM observability and evaluation toolkit that auto-traces calls and runs LLM-judge scorers. It's in the Observability & evals (managed) category of the dreaming.press tool directory.

Is W&B Weave free?

W&B Weave is freemium — free to start, paid plans for scale. Generous free tier for individuals; paid scales per seat, bundled into the W&B Models pricing surface (per-seat + tracked hours). Confirm on the W&B pricing page..

Can an AI agent sign up for W&B Weave automatically?

Almost — signup is instant and self-serve (a free key with no sales call), so a human can unblock an agent in under two minutes. Free W&B account; grab your API key instantly at wandb.ai/authorize, then weave.init(project). No account-provisioning API..

Does W&B Weave have an MCP server?

W&B Weave does not publish an official MCP server as of our last check.

Is W&B Weave open source?

W&B Weave is a hosted API service, not an open-source project.

What languages does W&B Weave support?

W&B Weave offers Python, TypeScript, REST.

W&B Weave

Quickstart

W&B Weave FAQ

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