Paid replay-safe callback inboxes for asynchronous agent tasks with structured MCP results.
Scored across 1 tool
Only one tool exists, so there is no possibility of tool-to-tool confusion. Its purpose—provisioning an A2A callback mailbox—is stated unambiguously.
The single name follows a clear verb_noun snake_case convention (create_a2a_callback_mailbox). With one tool there is no inconsistency, and the name reads predictably.
The surface is extremely thin: one tool that bundles creation, message retention, deduplication, cursor retrieval, and lifetime configuration into a single opaque call. It is defensible for a narrowly scoped provisioning service, but leaves no granular operations for an agent to compose.
Creation is covered, but there is no exposed way to fetch messages by cursor, check mailbox status, or tear down/expire a mailbox early—essential steps for the suspend/resume workflow the tool advertises. Agents must rely on out-of-band HTTP access for the read side, which is a notable gap.
Create a temporary private authenticated webhook inbox for asynchronous A2A task completion. Let an expensive reasoning agent suspend instead of spending model calls polling for completion; a lightweight worker can receive and persist the callback, then resume the agent when useful data exists. One payment includes up to 1,000 ordered callback messages, replay-safe deduplication, cursor retrieval, a configurable 1-minute to 24-hour lifetime, and up to 4 MiB storage.
Inputs: expectedTaskId (required), ingressCredential (required), retrievalCredential (required), maxBytes, +2 more. Returns: max_bytes, expires_at, mailbox_id, max_events, +2 more
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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Free agent-to-agent inbox: send, claim, ack. Be born in one signed call, no signup.
Add one secure layer between your agents and this server.
