inbox.get_thread
Fetch the full email thread for an inbox item
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| item_id | Yes | Inbox item id |
Output Schema
| Name | Required | Description | Default |
|---|---|---|---|
| data | Yes | ||
| meta | No |
Fetch the full email thread for an inbox item
| Name | Required | Description | Default |
|---|---|---|---|
| item_id | Yes | Inbox item id |
| Name | Required | Description | Default |
|---|---|---|---|
| data | Yes | ||
| meta | No |
Changes observed during successful MCP inspections.
Output schema / properties / data / items / properties / body / anyOfRemoved value: -[
- {
- "type": "string"
- },
- {
- "type": "null"
- }
-]Output schema / properties / data / items / properties / body / typeAdded value: +[
+ "string",
+ "null"
+]Output schema / properties / data / items / properties / from / anyOfRemoved value: -[
- {
- "type": "string"
- },
- {
- "type": "null"
- }
-]Output schema / properties / data / items / properties / from / typeAdded value: +[
+ "string",
+ "null"
+]Output schema / properties / data / items / properties / id / anyOfRemoved value: -[
- {
- "type": "string"
- },
- {
- "type": "number"
- }
-]Output schema / properties / data / items / properties / id / typeAdded value: +[
+ "string",
+ "number"
+]Output schema / properties / data / items / properties / preview / anyOfRemoved value: -[
- {
- "type": "string"
- },
- {
- "type": "null"
- }
-]Output schema / properties / data / items / properties / preview / typeAdded value: +[
+ "string",
+ "null"
+]Output schema / properties / data / items / properties / sent_at / anyOfRemoved value: -[
- {
- "type": "string"
- },
- {
- "type": "null"
- }
-]Output schema / properties / data / items / properties / sent_at / typeAdded value: +[
+ "string",
+ "null"
+]Output schema / properties / meta / properties / next_page / anyOfRemoved value: -[
- {
- "type": "string"
- },
- {
- "type": "null"
- }
-]Output schema / properties / meta / properties / next_page / typeAdded value: +[
+ "string",
+ "null"
+]Output schema / properties / meta / properties / total_count / anyOfRemoved value: -[
- {
- "type": "number"
- },
- {
- "type": "null"
- }
-]Output schema / properties / meta / properties / total_count / typeAdded value: +[
+ "number",
+ "null"
+]Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare readOnlyHint=true, idempotentHint=true, destructiveHint=false and openWorldHint=true, so the safety profile is fully covered without description help. The description's use of 'full' adds a small hint that the whole thread rather than a truncated view is returned, but nothing is said about whether reading marks the item read, pagination, or attachment handling.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
One sentence, front-loaded with the verb and resource, zero wasted words. Nothing padded or repeated from the schema.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
With rich annotations, a 100% documented single parameter, and an output schema covering return values, the description is close to sufficient. The remaining gap is the lack of explicit contrast with inbox.get for an agent choosing between them.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% with a single required parameter documented as 'Inbox item id', so the schema carries the semantics. The description only restates 'for an inbox item' and adds no format, sourcing, or ID-resolution detail beyond that.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
States a specific verb ('Fetch') and resource ('full email thread') scoped to 'an inbox item', which is clearly distinct from siblings like inbox.get or inbox.list. It stops short of explicitly contrasting itself with inbox.get, which fetches a single item, so the differentiation from that closest sibling is only inferable.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
Usage is only implied: the word 'full' hints that this is the right tool when the complete conversation is needed rather than the single item returned by inbox.get, but no when-to-use condition or alternative is named. An agent must infer the routing decision from sibling names alone.
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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