Experiment Schemas

Checkpoint selectors, patch operations, intervention specs, trial plans, validity gates, hypotheses, and arms.

CheckpointSelector

{ "kind": "first" }
{ "kind": "latest" }
{ "kind": "name", "value": "before-final" }

PatchOperation

Patch operations support JSON Patch operations plus mask_span and replace_text.

InterventionSpec

Field	Type
`kind`	intervention kind
`target`	refs such as `refId`, `eventId`, `eventType`, `toolName`, `modelCallId`, `artifactId`, `jsonPointer`
`operations`	patch operation array
`patch`	JSON payload
`expectedBaseHash`	optional stale-target guard
`description`	optional string

TrialPlan

Field	Values
`repetitions`	positive integer, default `1`
`concurrency`	positive integer, default `1`
`maxReplays`	positive integer, default `20`
`seedPolicy`	`none`, `fixed`, `indexed`
`stopRule`	`none`, `first_supported`, `first_invalid`

ValidityGate

minimum_trials
max_fixture_dependency_rate
max_non_comparable_rate
requires_effect_size

Current Runner Note

The schema includes concurrency and stop-rule fields. wait=false runs through durable local worker jobs, but execution inside one experiment is still serial.