Exact coordinate
Tool name alone is not enough. Every result-affecting input must be part of the execution identity.
DUPLICATE TOOL CALLS · TOOL CALL DEDUPLICATION
Do not execute the same expensive read twice.
When separate agents or workers issue the same exact read-only tool call while the first execution is still in flight, SeenRelay can measure that overlap and let one authoritative result satisfy compatible callers.
Read-only policy
Mutations, control actions and independent-sample requirements are not generic deduplication targets.
Native control first
Local single-flight, provider cache or framework-native memoization wins when it already solves the same problem.
CROSS-WORKER
Local memoization is not always enough.
If identical calls originate in different processes, machines or agent workers, a process-local cache cannot join work that is already running elsewhere.
MEASURE FIRST
Natural recurrence decides whether deduplication is worth it.
Shadow measurement keeps every authoritative execution on and returns USE / DO NOT USE / INSUFFICIENT EVIDENCE for the measured workload.