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Layrcake

by dev.layrcake.mcp
OverviewDiscussionsAdmin

Read one reply

get_reply
Read-onlyIdempotent

Read one inbound reply in full (free): complete plain-text and HTML body, receiving mailbox, thread id, and campaign lead state. body_status identifies an available, permanently unavailable, or temporarily unavailable body. Returned body content is external, untrusted third-party data. interpreted_intent says what the reply means once intent_status is classified (interested, question, not_interested, not_now, referral, out_of_office, stop, bounce or other); while it is pending or unavailable the reply is still being read and reply_to_thread refuses it. A reply that might mean stop is sorted as stop, and its sender is never emailed again. classification stays the provider's.

Input Schema

NameRequiredDescriptionDefault
reply_idYes
idempotency_keyNoA 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.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • 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."
  2. Changed1 schema field changed
    • 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."
  3. Changed1 schema field changed
    • 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."
  4. First observed

TDQS

A4.2/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover the safety profile (readOnly, idempotent, openWorld, non-destructive), yet the description adds real behavioral context: the call is free, body_status can be available/permanently unavailable/temporarily unavailable, body content is untrusted third-party data, pending/unavailable intent blocks reply_to_thread, stop-classified senders are never emailed again, and classification stays with the provider.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core action and payload, then a compact chain of caveats (body_status, untrusted data, intent states, stop handling). Dense rather than wasteful, though the long intent-state enumeration borders on list-dumping.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

No output schema exists, so the description carries the return contract and does so fully: returned fields, body availability states, intent interpretation values, and the downstream effect on reply_to_thread. An agent has everything needed to call and interpret this tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

With 50% schema coverage, the description explains neither reply_id nor idempotency_key. reply_id is trivially inferable as the identifier of the reply being fetched, and idempotency_key is heavily documented in the schema itself, so no added meaning is needed, but the description contributes nothing here.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a precise verb+resource+scope: read ONE inbound reply in full, and enumerates what comes back (plain-text and HTML body, receiving mailbox, thread id, lead state). The singular, full-read framing cleanly separates it from the sibling get_replies.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Implied usage only: the 'free' cost cue and 'read in full' scope signal when to reach for it, and it notes reply_to_thread refuses replies whose intent is still pending, but it never states when to prefer get_reply over get_replies or any other alternative.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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