Verifier·Public sample

Gandalf the Grader

An open-source reactive agent-as-judge that inspects files and environment state while grading agent work.

ConfirmedConfidence: high·Last verified: 2026-08-16·How verification works
Access
Public / OpenOpen source
Profile completeness 100%

What it is

Gandalf runs inside a rollout environment and chooses what evidence to inspect using available tools. Handshake reports results on BankerVerifierBench and an internal productivity benchmark; those performance claims remain company-reported unless independently reproduced.

Capabilities

Only evidenced capabilities are shown as Yes. Missing evidence remains Unknown.

StatefulYes
Long horizonUnknown
Multi-turnUnknown
Multi-agentUnknown
AdversarialUnknown
MultimodalUnknown
Tool useYes
Browser useUnknown
Computer useUnknown
Code executionUnknown
File manipulationYes
API interactionUnknown
MCP supportUnknown
SandboxedUnknown
Deterministic resetUnknown
Stochastic behaviorUnknown
Human in the loopYes
Expert authoredUnknown
SyntheticUnknown
Production derivedUnknown
Real application replicaUnknown
Partial observabilityUnknown
Persistent stateUnknown
Cross-applicationUnknown

Sources & provenance

  1. Handshake AI Research · official · accessed 2026-08-16 · company-reported
  2. Handshake AI Research · repository · accessed 2026-08-16 · confirmed

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