email-spam-tester

Get a test address

get_test_address

Reserve a single-use address to send a draft email to, for a full check.

Returns the address and the URL its report will appear at. The address
accepts exactly one message and expires after an hour. The email has to be
sent by the person, from the platform or mailbox they really send from:
half the checks read what that platform adds. The report covers 42 checks
(SPF, DKIM, DMARC, reverse DNS, TLS, blocklists, content, links, the
Gmail and Yahoo bulk-sender rules) and a plan of what to fix.

lang is decided now because the message arrives minutes later over SMTP,
which carries no hint of who is waiting for it. What wait_for_report
returns quotes check lines in English whatever it is set to; the person
following report_url sees their own language.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`lang`	No	ISO code of the language the report and the fix plan are written in for the person who opens the report page, for example "en", "de" or "pt-BR". Defaults to the language of the conversation. Unknown codes fall back to English.
`include_placement`	No	Also check which folder (inbox, spam, promotions) the email lands in at different mailbox providers, from the same send. The email then goes to a list of recipients instead of one address and needs a marker in the subject; both come back. Some provider inboxes are public test inboxes: the subject, the sender name and the folder are shown on a public web page, so it suits messages that are not confidential.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`view`	Yes	test, report, mailbox, mailboxes, series or error

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 30, 2026

changedInput schema / properties / include_placement / description

Previous value: -"Also check which folder (inbox, spam, promotions) the email lands in at different mailbox providers, from the same send. The email then goes to a list of recipients instead of one address and needs a marker in the subject; both come back. Some provider inboxes are public test inboxes: the subject, the sender name and the folder are shown on a public web page. Only set it when the person asked for placement and the message is not confidential; say so to them."New value: +"Also check which folder (inbox, spam, promotions) the email lands in at different mailbox providers, from the same send. The email then goes to a list of recipients instead of one address and needs a marker in the subject; both come back. Some provider inboxes are public test inboxes: the subject, the sender name and the folder are shown on a public web page, so it suits messages that are not confidential."

Changed11 schema fields changedSep 30, 2026

addedInput schema / properties / include_placement

Added value: +{
+  "default": false,
+  "description": "Also check which folder (inbox, spam, promotions) the email lands in at different mailbox providers, from the same send. The email then goes to a list of recipients instead of one address and needs a marker in the subject; both come back. Some provider inboxes are public test inboxes: the subject, the sender name and the folder are shown on a public web page. Only set it when the person asked for placement and the message is not confidential; say so to them.",
+  "title": "Include Placement",
+  "type": "boolean"
+}

addedInput schema / properties / lang / anyOf

Added value: +[
+  {
+    "type": "string"
+  },
+  {
+    "type": "null"
+  }
+]

changedInput schema / properties / lang / default
```
Previous value: -"en"New value: +null
```

changedInput schema / properties / lang / description

Previous value: -"ISO code of the language the report and the fix plan are written in for the person who opens the report page, for example \"en\", \"de\" or \"pt-BR\". Unknown codes fall back to English."New value: +"ISO code of the language the report and the fix plan are written in for the person who opens the report page, for example \"en\", \"de\" or \"pt-BR\". Defaults to the language of the conversation. Unknown codes fall back to English."

removedInput schema / properties / lang / type
```
Removed value: -"string"
```
addedOutput schema / additionalProperties
```
Added value: +true
```

addedOutput schema / description

Added value: +"What every tool returns for the card; `view` says which card."

removedOutput schema / properties / result

Removed value: -{
-  "title": "Result",
-  "type": "string"
-}

addedOutput schema / properties / view

Added value: +{
+  "description": "test, report, mailbox, mailboxes, series or error",
+  "title": "View",
+  "type": "string"
+}

changedOutput schema / required

Previous value: -[
-  "result"
-]New value: +[
+  "view"
+]

changedOutput schema / title

Previous value: -"get_test_addressOutput"New value: +"Output"

Changed1 schema field changedSep 18, 2026

addedInput schema / properties / lang / description

Added value: +"ISO code of the language the report and the fix plan are written in for the person who opens the report page, for example \"en\", \"de\" or \"pt-BR\". Unknown codes fall back to English."

First observedSep 17, 2026

TDQS

A4.6/5.0

Behavior5/5

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

Annotations only say readOnlyHint=false, openWorldHint=true, idempotentHint=false. The description adds far more: the address is single-use, accepts exactly one message, expires after an hour, and the resulting report covers 42 named check categories plus a fix plan. It also discloses a non-obvious behavioural split -- wait_for_report always quotes check lines in English while report_url renders the recipient's language.

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?

It is front-loaded with the core action and constraint, and most sentences carry non-obvious information. It is nonetheless long for a two-parameter tool and a few asides (e.g. 'which carries no hint of who is waiting for it', 'half the checks read what that platform adds') could be tightened without losing meaning.

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?

An output schema exists, so return values need not be spelled out, and the safety profile is covered by annotations. What the description does supply -- what the address accepts, its expiry, the sender requirement, report contents, and language behaviour -- is everything an agent needs to call this correctly within the workflow.

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

Parameters4/5

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

Schema coverage is 100%, so the baseline is 3, but the description adds real meaning beyond the schema for lang: it must be chosen at reservation time because the later SMTP delivery carries no language hint, and it affects the report page rather than the wait_for_report output. include_placement is left to the schema, which already documents it thoroughly.

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?

The description gives a specific verb and resource -- 'Reserve a single-use address to send a draft email to, for a full check' -- and immediately clarifies scope (one message, one hour TTL). It is clearly distinguishable from the siblings, since the actual report retrieval is routed to wait_for_report and report_url.

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

Usage Guidelines4/5

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

It states the usage condition clearly: the person must send the email themselves, from the platform or mailbox they really send from, because half the checks read what that platform adds. It also names the division of labour with wait_for_report. There is no explicit 'when not to use this' case, so it stops short of a 5.

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

All email-spam-tester tools Inspect

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