Layrcake

Send a reply email

reply_to_thread

Destructive

Send a real email in an inbound reply's existing thread from the mailbox that received it. An unconfirmed request returns a preview, confirmation_token, and approval_url. After a person approves, Layrcake runs it itself when the result's approval block says execution: server (a launch starts at its first-send time); otherwise, repeat the call with that token and a stable idempotency_key. Repeating is always safe and never runs it twice. Calling again without a token while the same request is still waiting for a decision returns that approval and sends no second email; after it was declined, expired or cancelled, calling again without a token asks again with a new confirmation_token. Requires reply:send, which is not granted by default. Refuses while any reply from this sender is pending or unavailable; wait until get_reply shows its interpreted_intent. Only one reply is allowed per inbound message; suppressed contacts are refused, and sender and subject are derived. operation_unknown_state includes an operation_id whose status is available from get_operation. dry_run: true returns an advisory estimate as of evaluated_at, reserves nothing, and may differ from a later execution plan.

Input Schema

TableJSON Schema

Name	Required	Description
`dry_run`	No
`reply_id`	Yes
`body_text`	Yes
`supersedes`	No	The confirmation_token of the approval this request replaces. Needed only when that approval was already approved and hasn't started yet; one still waiting for a decision is replaced automatically. Only where Layrcake runs approved actions itself (the result's approval block says execution: server); anywhere else it is refused. A dry run doesn't check it, so it refuses it: send it on the call itself.
`idempotency_key`	No	A payment_required refusal means services are stopped for unpaid billing; direct the owner to the billing link in the error. Campaigns stay paused after payment until restarted. Optional for search and enrichment tools: supply one so a retry returns the original result without paying again; if that call failed with provider_unavailable, rate_limited or insufficient_credits (after a top-up), a retry runs it once more after its cooldown (30 s, or a longer retry_after_seconds; insufficient_credits as soon as the balance covers it), unless its provider may already have done the work. Required for tools that create an external side effect; reuse the same value after a timeout or an approval. A stored failure comes back with details.replayed: true; with retry_after_seconds, retry the same value after that.
`confirmation_token`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 3, 2026

changedInput schema / properties / idempotency_key / description

Previous value: -"Optional for search and enrichment tools: supply one so a retry returns the original result without paying again; if that call failed with provider_unavailable, rate_limited or insufficient_credits (after a top-up), a retry runs it once more after its cooldown (30 s, or a longer retry_after_seconds; insufficient_credits as soon as the balance covers it), unless its provider may already have done the work. Required for tools that create an external side effect; reuse the same value after a timeout or an approval. A stored failure comes back with details.replayed: true; with retry_after_seconds, retry the same value after that."New value: +"A payment_required refusal means services are stopped for unpaid billing; direct the owner to the billing link in the error. Campaigns stay paused after payment until restarted. Optional for search and enrichment tools: supply one so a retry returns the original result without paying again; if that call failed with provider_unavailable, rate_limited or insufficient_credits (after a top-up), a retry runs it once more after its cooldown (30 s, or a longer retry_after_seconds; insufficient_credits as soon as the balance covers it), unless its provider may already have done the work. Required for tools that create an external side effect; reuse the same value after a timeout or an approval. A stored failure comes back with details.replayed: true; with retry_after_seconds, retry the same value after that."

Changed1 schema field changedSep 29, 2026

changedInput schema / properties / supersedes / description

Previous value: -"The confirmation_token of the approval this request replaces. Needed only when that approval was already approved and hasn't started yet; one still waiting for a decision is replaced automatically. Only where Layrcake runs approved actions itself (the result's approval block says execution: server); anywhere else it is refused."New value: +"The confirmation_token of the approval this request replaces. Needed only when that approval was already approved and hasn't started yet; one still waiting for a decision is replaced automatically. Only where Layrcake runs approved actions itself (the result's approval block says execution: server); anywhere else it is refused. A dry run doesn't check it, so it refuses it: send it on the call itself."

Changed1 schema field changedSep 28, 2026

addedInput schema / properties / supersedes

Added value: +{
+  "description": "The confirmation_token of the approval this request replaces. Needed only when that approval was already approved and hasn't started yet; one still waiting for a decision is replaced automatically. Only where Layrcake runs approved actions itself (the result's approval block says execution: server); anywhere else it is refused.",
+  "format": "uuid",
+  "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$",
+  "type": "string"
+}

Changed1 schema field changedSep 28, 2026

changedInput schema / properties / idempotency_key / description

Previous value: -"Optional for search and enrichment tools: supply one to make a retry replay the original result. Required for tools that create an external side effect; reuse the same value after a timeout or an approval."New value: +"Optional for search and enrichment tools: supply one so a retry returns the original result without paying again; if that call failed with provider_unavailable, rate_limited or insufficient_credits (after a top-up), a retry runs it once more after its cooldown (30 s, or a longer retry_after_seconds; insufficient_credits as soon as the balance covers it), unless its provider may already have done the work. Required for tools that create an external side effect; reuse the same value after a timeout or an approval. A stored failure comes back with details.replayed: true; with retry_after_seconds, retry the same value after that."

Changed1 schema field changedSep 23, 2026

changedInput schema / properties / idempotency_key / description

Previous value: -"Stable retry key; the same value identifies retries of the same request after timeout or approval."New value: +"Optional for search and enrichment tools: supply one to make a retry replay the original result. Required for tools that create an external side effect; reuse the same value after a timeout or an approval."

First observedSep 21, 2026

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