Module rule_filter 

Parsed forms of task-events: and events: gnome rule check expressions.

A rule TOML file uses the check field to declare what event query must return zero results for the rule to be satisfied:

check = "task-events:cargo::rustc error.code=E0308"
check = "events:scope=service(noisetable-api.pdx) level=error"

TaskEventsRuleFilter is the original parsed form for task-events:. EventsRuleFilter is the generalized form for both events: and task-events: (which desugars to events: with scope: ScopeSpec::CurrentTaskRun).

@yah:ticket(Q068-F1, “Broaden task-events: rule grammar to unified events: form (scryer-aware)”) @yah:assignee(agent:claude) @yah:at(2026-05-09T00:00:00Z) @yah:status(review) @yah:parent(Q068) @yah:handoff(“Q068-F1 landed 2026-05-09. New EventsRuleFilter + ScopeSpec types in crates/yah/task-runs/src/rule_filter.rs. EventsRuleFilter accepts both ‘events:’ and ‘task-events:’ prefixes; scope=service() routes to scryer, scope=taskrun(…) desugars to CurrentTaskRun. gnomes/src/rules.rs: RuleCheck::Events { filter: EventsRuleFilter } added; task-events: and events: both parse to this variant. gnomes/src/verify.rs: ForgeVerifyDispatch gained optional scryer: Option<Arc> (via with_scryer() builder); Service-scope queries route to scryer.events(Service(MeshIdent(…))), absent scryer → N/A. task-runs/src/lib.rs re-exports EventsRuleFilter + ScopeSpec. gnomes/Cargo.toml: workload-spec dep added. 186 gnomes tests pass (3 new verify tests); 29 rule_filter tests pass (10 new EventsRuleFilter tests); cargo check –workspace clean.”) @yah:verify(“cargo test -p task-runs rule_filter — all EventsRuleFilter parse tests pass.”) @yah:verify(“cargo test -p gnomes verify:: — forge_dispatch, events_prefix_current_taskrun_scope, events_service_scope all pass.”) @arch:see(.yah/docs/architecture/A036-yah-gnomes.md) @arch:see(.yah/docs/architecture/A049-yah-scryer.md) @arch:see(.yah/docs/working/yah-task-runs.md)

Structs

EventsRuleFilter

Parsed predicate from an events:<expr> (or task-events:<expr>) rule check.

FieldPredicate

One field-level equality predicate within a task-events: check.

ParseError

TaskEventsRuleFilter

Parsed predicate from a task-events:<expr> rule check field.

Enums

ScopeSpec

Which event store to query when evaluating an events: rule check.