Generect

Validate email deliverability

validate_email

Check deliverability of emails you already have. Billable: about $0.005 per email submitted (every address is billed, whatever the verdict) at the Tier 0 list price. Accounts can pay a different rate: get_balance returns this account's prices, and every response reports what was actually spent in cost.amount_charged_usd. This is the one operation where every submitted address is billed: the verdict is the deliverable. An address generate_email returned as valid is already verified, so validating it again only adds cost.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "emails": "<emails>"
    },
    "name": "validate_email"
  }
}

Input Schema

Name	Required	Description	Default
`emails`	Yes	Email addresses to validate. Each one is billed.
`timeout_ms`	No	Request timeout in milliseconds.

Output Schema

Name	Required	Description	Default
`cost`	No
`results`	No
`submitted`	No
`test_mode`	No
`test_mode_notice`	No
`vocabulary_warnings`	No
`deprecated_params_ignored`	No

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedOct 7, 2026

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

removedInput schema / additionalProperties
```
Removed value: -false
```

changedOutput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

addedOutput schema / properties / deprecated_params_ignored / propertyNames
```
Added value: +{
+  "type": "string"
+}
```
addedOutput schema / properties / vocabulary_warnings / items
```
Added value: +{}
```

Changed1 schema field changedSep 24, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "cost": {
+      "additionalProperties": false,
+      "properties": {
+        "amount_charged_usd": {
+          "type": [
+            "number",
+            "null"
+          ]
+        },
+        "billed": {
+          "type": "string"
+        },
+        "note": {
+          "type": "string"
+        },
+        "operation": {
+          "type": "string"
+        }
+      },
+      "type": "object"
+    },
+    "deprecated_params_ignored": {
+      "additionalProperties": {
+        "type": "string"
+      },
+      "type": "object"
+    },
+    "results": {},
+    "submitted": {
+      "type": "number"
+    },
+    "test_mode": {
+      "type": "boolean"
+    },
+    "test_mode_notice": {
+      "type": "string"
+    },
+    "vocabulary_warnings": {
+      "type": "array"
+    }
+  },
+  "type": "object"
+}

AddedSep 10, 2026

TDQS

A4.3/5.0

Behavior4/5

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

Annotations only declare readOnlyHint=false, destructiveHint=false and openWorldHint=true; the description goes well beyond them with the per-address flat fee, the fact that failed verdicts are still billed, account-specific rate variation, and the cost.amount_charged_usd response field. Minor gap: no disclosure of latency, batching limits, or rate limits for large email arrays.

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

Conciseness3/5

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

Purpose is front-loaded, but the billing thesis is restated three times ('every address is billed, whatever the verdict', 'the one operation where every submitted address is billed: the verdict is the deliverable'), which is redundant. The pricing and sibling-dedup content earns its place; the repetition does not.

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?

For a two-parameter billing-sensitive tool with an output schema, the description covers the cost model, the actual-rate lookup path, the response cost field, and the overlap with generate_email. Nothing an agent needs to decide whether to call it or to predict charges is missing.

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?

Schema coverage is 100%, so the schema already documents both parameters, including 'Each one is billed.' The description reinforces the per-item billing economics with a concrete unit price but adds no syntax or format detail, and timeout_ms is not mentioned at all. Baseline 3 is appropriate.

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 specific verb and resource ('Check deliverability of emails') plus a scoping qualifier ('emails you already have'), and later distinguishes it from generate_email, whose valid output is already verified. An agent can tell exactly what this does and where its boundary lies without opening the schema.

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

Usage Guidelines5/5

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

Gives both a when-to-use condition (addresses already in hand) and an explicit when-not-to-use case, warning that re-validating a generate_email result 'only adds cost.' It also names get_balance as the route to account-specific pricing, so the alternative is actionable.

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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