Summer 2025

Fulcrum

The agentic debugger for AI systems

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What they do

red-teaming agents that find bugs in RL environments and agents

How close to us

2, near

checks only; tests other people's agents and environments, not business output.

Wedges

  • W2 Seeing whether your AI agents actually produce adjacent
L1 Company brain (knows the organisation) 0, none
L2 Agent team (runs agents, tools, approvals) 0, none
L3 Does and learns (finishes, checks, measures, updates the brain) 1, light

Who buys

Firm size
not known
Buyer type
developer
Role
AI lab engineers
UK
not known
Their own description (from YC)

We build red-teaming agents that help developers fix their RL environments and improve their agents.

Our customers are tired of being bullshitted by their agents.

Full teardown

No full teardown yet. On the deep list.

Technical detail
Slug
fulcrum
Lens hash
179096c479
Pass
screen
Stale
no