io.usefulapi/missive
REMOTE · MISSIVE.USEFULAPI.IO · SCANNED SEP 21
Read email/chat conversations, messages, contacts and teams; draft, send and update threads.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security78
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token. View diagnostics → Pass
- HTTPS enforcement could not be verified: the plaintext port answered with HTTP 401, which proves neither a plaintext path nor enforcement. View diagnostics → Unverified
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
- The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents. View diagnostics → Partial
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability80
- AI-judged instruction clarity (excellent).Pass
- Tool/resource definitions use about 1881 tokens (~99/item across 19 items; 19 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 19 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 19 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
How do I install the io.usefulapi/missive MCP server?
io.usefulapi/missive is a hosted endpoint at https://missive.usefulapi.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · missive.usefulapi.io
claude mcp add --transport http io-usefulapi-missive 'https://missive.usefulapi.io/mcp'
{
"mcpServers": {
"io-usefulapi-missive": {
"url": "https://missive.usefulapi.io/mcp"
}
}
} {
"servers": {
"io-usefulapi-missive": {
"type": "http",
"url": "https://missive.usefulapi.io/mcp"
}
}
} [mcp_servers.io-usefulapi-missive] url = "https://missive.usefulapi.io/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"io-usefulapi-missive": {
"type": "remote",
"url": "https://missive.usefulapi.io/mcp",
"enabled": true
}
}
} openclaw mcp add io-usefulapi-missive --url 'https://missive.usefulapi.io/mcp' --transport streamable-http
mcp_servers:
io-usefulapi-missive:
url: "https://missive.usefulapi.io/mcp" {
"McpServers": {
"io-usefulapi-missive": {
"Transport": "http",
"Url": "https://missive.usefulapi.io/mcp"
}
}
} assistant mcp add io-usefulapi-missive -t streamable-http -u 'https://missive.usefulapi.io/mcp'
{
"mcpServers": {
"io-usefulapi-missive": {
"type": "http",
"url": "https://missive.usefulapi.io/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 26 Aug 26 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 9 Aug 26 0
- Authorization: fail → pass ▲ security
- 8 Aug 26 0
- Authorization: pass → fail ▼ security
- 31 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 28 Jul 26 0
- Stability: unverified → 0.03 ▲ functional
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 21 Sept 2026 · Probed https://missive.usefulapi.io/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=usefulapi.io | CN=WE1,O=Google Trust Services,C=US | 16 Sept 2026 | 15 Dec 2026 | ECDSA 256 | ECDSA-SHA256 | 8670032d6b0d0d5e1333dd39e780a6a8 |
| SANs: usefulapi.io, missive.usefulapi.io, *.missive.usefulapi.io | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of missive.usefulapi.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| io. | present | 57355 | 8 | Verified |
| usefulapi.io. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication Enforced and verified
The endpoint asked for a token and published valid RFC 9728 metadata describing how to get one.
| Result | Enforced and verified |
|---|---|
| Enforced | On tool calls |
| HTTP status | 200 |
WWW-Authenticate challenge Bearer realm="OAuth", resource_metadata="https://missive.usefulapi.io/.well-known/oauth-protected-resource/mcp", error="invalid_token", error_description="Missing or invalid access token"
Bearer realm="OAuth", resource_metadata="https://missive.usefulapi.io/.well-known/oauth-protected-resource/mcp", error="invalid_token", error_description="Missing or invalid access token"Protected resource metadata
| Document | https://missive.usefulapi.io/.well-known/oauth-protected-resource/mcp |
|---|---|
| Retrieved | Yes |
| Resource | https://missive.usefulapi.io/mcp |
| Authorisation server | https://missive.usefulapi.io |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://missive.usefulapi.io/mcp | Verified | 200 | |
| http (plaintext) | http://missive.usefulapi.io/mcp | Inconclusive | 401 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
missive_create_contact Create contact ~106
Create a contact in the given contact book. Missive: POST /contacts.
| Name | Type | Req | Description |
|---|---|---|---|
| contact_book | string | yes | The contact book id to create the contact in (required). |
| first_name | string | – | First name. |
| infos | array | – | Contact info entries (email/phone/etc. objects). |
| last_name | string | – | Last name. |
| memberships | array | – | Group/organization membership objects. |
| starred | boolean | – | Whether the contact is starred. |
No output schema declared.
No examples provided.
missive_create_draft Create draft ~241
Create a draft email/message. WARNING: setting send=true SENDS a real email immediately (send_at schedules it) instead of saving a draft. Attach to an existing thread with `conversation`. Missive: POST /drafts.
| Name | Type | Req | Description |
|---|---|---|---|
| add_assignees | array | – | User ids to assign to the conversation. |
| add_shared_labels | array | – | Shared label ids to apply. |
| bcc_fields | array | – | Bcc recipients. |
| body | string | yes | The message body (HTML) — required. |
| cc_fields | array | – | Cc recipients. |
| conversation | string | – | Attach the draft to an existing conversation id. |
| from_field | object | – | The sender ({address, name?}). |
| organization | string | – | Organization id to send from. |
| references | array | – | Message-ID references (for threading). |
| send | boolean | – | If true, SEND the email immediately instead of saving a draft. |
| send_at | number | – | Unix timestamp to schedule the send. |
| subject | string | – | The subject line. |
| to_fields | array | – | Recipients ({address, name?}). |
No output schema declared.
No examples provided.
missive_get_contact Get contact ~41
Get a single contact by id. Missive: GET /contacts/{id}.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The resource id (a UUID-like string). |
No output schema declared.
No examples provided.
missive_get_conversation Get conversation ~43
Get a single conversation by id. Missive: GET /conversations/{id}.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The resource id (a UUID-like string). |
No output schema declared.
No examples provided.
missive_get_message Get message ~60
Get a single message, including the full body. Missive: GET /conversations/{conversation_id}/messages/{id}.
| Name | Type | Req | Description |
|---|---|---|---|
| conversation_id | string | yes | The conversation id the message belongs to. |
| id | string | yes | The message id. |
No output schema declared.
No examples provided.
missive_list_contact_books List contact books ~61
List contact books (address books). Missive: GET /contact_books.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max contact books to return (default 50, max 200). |
| offset | integer | – | Number of records to skip (offset pagination). |
No output schema declared.
No examples provided.
missive_list_contact_groups List contact groups ~87
List contact groups or organizations within a contact book. Missive: GET /contact_groups.
| Name | Type | Req | Description |
|---|---|---|---|
| contact_book | string | yes | The contact book id (required). |
| kind | string | yes | Which kind to list: "group" or "organization". |
| limit | integer | – | Max records to return. |
| offset | integer | – | Number of records to skip (offset pagination). |
No output schema declared.
No examples provided.
missive_list_contacts List contacts ~128
List contacts in a contact book. Missive: GET /contacts.
| Name | Type | Req | Description |
|---|---|---|---|
| contact_book | string | yes | The contact book id to list contacts from (required). |
| include_deleted | boolean | – | Include deleted contacts. |
| limit | integer | – | Max contacts to return (default 50, max 200). |
| modified_since | number | – | Unix timestamp — only contacts modified since. |
| offset | integer | – | Number of records to skip (offset pagination). |
| order | string | – | Sort order (default "last_name"). |
| search | string | – | Free-text search over contacts. |
No output schema declared.
No examples provided.
missive_list_conversation_comments List conversation comments ~81
List internal comments (team chat) on a conversation. Missive: GET /conversations/{id}/comments.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The resource id (a UUID-like string). |
| limit | integer | – | Max records to return. |
| until | number | – | Unix timestamp cursor — return records older than this (offset-less pagination). |
No output schema declared.
No examples provided.
missive_list_conversation_drafts List conversation drafts ~79
List draft messages on a conversation. Missive: GET /conversations/{id}/drafts.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The resource id (a UUID-like string). |
| limit | integer | – | Max records to return. |
| until | number | – | Unix timestamp cursor — return records older than this (offset-less pagination). |
No output schema declared.
No examples provided.
missive_list_conversation_messages List conversation messages ~88
List the messages (emails) in a conversation. Missive: GET /conversations/{id}/messages.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The resource id (a UUID-like string). |
| limit | integer | – | Max messages to return (default 10, max 10). |
| until | number | – | Unix timestamp cursor — return records older than this (offset-less pagination). |
No output schema declared.
No examples provided.
missive_list_conversation_posts List conversation posts ~82
List posts (integration/app-generated items) on a conversation. Missive: GET /conversations/{id}/posts.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | The resource id (a UUID-like string). |
| limit | integer | – | Max records to return. |
| until | number | – | Unix timestamp cursor — return records older than this (offset-less pagination). |
No output schema declared.
No examples provided.
missive_list_conversations List conversations ~268
List conversations (email/chat threads). Missive requires EXACTLY ONE mailbox-type filter — one of inbox / assigned / closed / flagged / snoozed / trashed / all / shared_label / team_inbox / team_all / organization. Missive: GET /conversations.
| Name | Type | Req | Description |
|---|---|---|---|
| all | boolean | – | All conversations. |
| assigned | boolean | – | Conversations assigned to you. |
| closed | boolean | – | Closed conversations. |
| contact_organization | string | – | Filter to a contact organization id. |
| string | – | Filter to conversations involving this email address. | |
| flagged | boolean | – | Flagged conversations. |
| inbox | boolean | – | Conversations in your inbox. |
| limit | integer | – | Max conversations to return (default 25, max 50). |
| organization | string | – | Filter to an organization id. |
| shared_label | string | – | Conversations under a shared label id. |
| snoozed | boolean | – | Snoozed conversations. |
| team_all | string | – | All of a team's conversations (team id). |
| team_inbox | string | – | Conversations in a team's inbox (team id). |
| trashed | boolean | – | Trashed conversations. |
| until | number | – | Unix timestamp cursor — return records older than this (offset-less pagination). |
No output schema declared.
No examples provided.
missive_list_organizations List organizations ~50
List organizations you belong to. Missive: GET /organizations.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max records to return. |
| offset | integer | – | Number of records to skip (offset pagination). |
No output schema declared.
No examples provided.
missive_list_responses List responses ~62
List canned responses / templates. Missive: GET /responses.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max records to return. |
| offset | integer | – | Number of records to skip (offset pagination). |
| organization | string | – | Filter to an organization id. |
No output schema declared.
No examples provided.
missive_list_shared_labels List shared labels ~68
List shared labels (team-shared folders/tags). Missive: GET /shared_labels.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max records to return. |
| offset | integer | – | Number of records to skip (offset pagination). |
| organization | string | – | Filter to an organization id. |
No output schema declared.
No examples provided.
missive_list_teams List teams ~63
List teams in the organization(s). Missive: GET /teams.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max records to return. |
| offset | integer | – | Number of records to skip (offset pagination). |
| organization | string | – | Filter to an organization id. |
No output schema declared.
No examples provided.
missive_list_users List users ~61
List users (team members). Missive: GET /users.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Max records to return. |
| offset | integer | – | Number of records to skip (offset pagination). |
| organization | string | – | Filter to an organization id. |
No output schema declared.
No examples provided.
missive_update_conversation Update conversation ~212
Update a conversation — assign/unassign users, add/remove shared labels, close/reopen, move to inbox, or set subject/color/team. Missive: PATCH /conversations/{id}.
| Name | Type | Req | Description |
|---|---|---|---|
| add_assignees | array | – | User ids to assign. |
| add_shared_labels | array | – | Shared label ids to add. |
| add_to_inbox | boolean | – | Move the conversation back to the inbox. |
| close | boolean | – | Close (archive) the conversation. |
| color | string | – | Set the conversation color. |
| id | string | yes | The resource id (a UUID-like string). |
| organization | string | – | Organization id (context for the update). |
| remove_assignees | array | – | User ids to unassign. |
| remove_shared_labels | array | – | Shared label ids to remove. |
| reopen | boolean | – | Reopen the conversation. |
| subject | string | – | Set the conversation subject. |
| team | string | – | Team id to move the conversation to. |
No output schema declared.
No examples provided.
What is the io.usefulapi/missive MCP server?
io.usefulapi/missive is an MCP server listed in the public MCP registry as io.usefulapi/missive. Read email/chat conversations, messages, contacts and teams; draft, send and update threads. This page covers its hosted endpoint (https://missive.usefulapi.io/mcp).
Is the io.usefulapi/missive MCP server safe to use?
io.usefulapi/missive scores 86 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the io.usefulapi/missive MCP server expose?
io.usefulapi/missive exposes 19 tools: missive_list_conversations, missive_get_conversation, missive_list_conversation_messages, missive_get_message, missive_list_conversation_comments, and 14 more. Their descriptions and schemas cost roughly 1,881 tokens of context every time the server is loaded.
Does the io.usefulapi/missive MCP server require authentication?
Yes. io.usefulapi/missive asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.
Is the io.usefulapi/missive MCP server still maintained?
io.usefulapi/missive is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.