MCP tools

Every tool Tigby's MCP server offers, what it does, and which endpoint it calls.

Tigby's MCP server is part of the API, not a separate process. It speaks the Model Context Protocol's Streamable HTTP transport and keeps no session: every message is a POST that carries its own protocol version, which is what lets both API nodes answer the same client.

Connecting

Remote. POST each JSON-RPC message to https://api.tigby.eu/api/mcp with an API key in Authorization: Bearer, an MCP-Protocol-Version header, and the Mcp-Method and Mcp-Name headers the transport mirrors the body into.

Local. tigby mcp is the same server over stdio, for a harness that launches its tools as processes:

{
  "mcpServers": {
    "tigby": { "command": "tigby", "args": ["mcp"] }
  }
}

It reads the credential from the CLI's profile, so tigby login is the whole of the setup; --api-key and TIGBY_API_KEY work too. Without the binary, npx -y @tigby/mcp runs it.

Protocol

Revision 2026-07-28 is what the server prefers, and the handshake-based revisions 2025-11-25, 2025-06-18, 2025-03-26 are served too, so a client that opens with initialize is answered rather than refused. The methods are server/discover, initialize, ping, tools/list and tools/call; the specification says what each one is.

Which tools you see depends on the key. An Admin Key or a console session sees all of them; an Identity Key sees the ones its key can call, which is every tool whose endpoint does not need Org scope – the Key column below says which is which, and it is read off the endpoint rather than declared beside it, so the list cannot invite you to call something and then refuse you. A tool call is the API call it names, made with the credential you presented, so an Identity Key naming another Identity's Handle is refused exactly as it would be over REST.

Errors are Tigby errors. A refused call comes back as a tool result with isError set, carrying the RFC 9457 problem body in structuredContent: a stable code to branch on, a doc_url, and an agent_hint saying whether to fix the call, wait, or stop.

One endpoint is deliberately not here. GET /api/identities/\{handle\}/identity-key hands over an Identity's first Identity Key and its Mailbox password, and no tool binds it. Every tool is a binding onto an endpoint and never a second implementation of one, so the way to keep a plaintext credential out of a model's context is to leave the route out of this catalog rather than to serve it differently here. That is what lets tigby_identity_get be read-only and repeatable in earnest: creating an Identity and polling until it is ready hands over nothing secret, and the person who operates the agent fetches its key.

The tools

Tool	What it does	Key
`tigby_handle_check`	Check a Handle	Admin Key
`tigby_identity_list`	List Identities	Admin Key
`tigby_identity_get`	Read an Identity	any
`tigby_identity_create`	Create an Identity	Admin Key
`tigby_identity_delete`	Delete an Identity	Admin Key
`tigby_identity_retry`	Retry provisioning	Admin Key
`tigby_card_get`	Read the A2A Card	any
`tigby_card_update`	Edit the A2A Card	any
`tigby_email_list`	List messages	any
`tigby_email_get`	Read a message	any
`tigby_email_send`	Send a message	any
`tigby_allowed_recipient_list`	List Allowed Recipients	any
`tigby_ai_disclosure_get`	Read the AI disclosure	any
`tigby_mail_status`	Read the mail kill switch	any
`tigby_event_list`	List Events	Admin Key
`tigby_event_get`	Read an Event	Admin Key
`tigby_webhook_list`	List Webhooks	any
`tigby_webhook_deliveries`	List Webhook deliveries	any
`tigby_vault_list`	List secrets	any
`tigby_vault_get`	Read a secret	any
`tigby_vault_set`	Write a secret	any
`tigby_vault_delete`	Remove a secret	any
`tigby_connector_list`	List Connectors	any
`tigby_connector_post`	Post on a platform	any
`tigby_connector_posts`	List posts	any
`tigby_connector_dm`	Send a direct message	any
`tigby_connector_thread`	Read a thread	any
`tigby_connector_notifications`	List notifications	any

`tigby_handle_check`

Check a Handle. Calls GET /api/handles/{handle}.

Says whether a Handle can still be registered, and – when it cannot – which rule refuses it. Call this before creating an Identity: a Handle is claimed for all time, so a create that fails on the name has still spent nothing, but a create that succeeds cannot be undone.

Argument	Type	What it is
`handle` (required)	string	The name to check, without the @.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_identity_list`

List Identities. Calls GET /api/identities.

Every Identity of the Org, with its status. The place to start when you do not know which Handles exist.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_identity_get`

Read an Identity. Calls GET /api/identities/{handle}.

One Identity in full: its status, the provisioning checklist step by step, its mail address, its profile URL, and the Tunnel – the hostname, the allocated TCP port and the URL an agent connects to. This is where you read whether a Tunnel is up and where it is reachable. It carries no credential in any state, so it is safe to repeat.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_identity_create`

Create an Identity. Calls POST /api/identities.

Reserves the Handle and starts the provisioning saga that assembles the Mailbox, the Tunnel, the A2A Card and the first Identity Key. Answers before the parts exist; poll tigby_identity_get until the status is ready or failed – that read carries no credential, so polling it puts nothing secret in front of you. The Identity Key and the Mailbox password are handed over by GET /api/identities/{handle}/identity-key, which no tool here binds; whoever operates this agent fetches them. A Handle is claimed permanently and counts against the Org's lifetime quota even after the Identity is deleted, so check the name first and create deliberately.

Argument	Type	What it is
`handle` (required)	string	The Handle to claim, without the @.

Writes, and each call is a new one. It changes nothing outside Tigby.

`tigby_identity_delete`

Delete an Identity. Calls DELETE /api/identities/{handle}.

Erases the Identity. Its keys are revoked first, then everything it owns goes: the Mailbox and every message in it, the Tunnel, the A2A Card, the keys, the Vault namespace, the Webhooks, the Allowed Recipients, the Events and the export archives. Each Connector's credential is revoked at the platform it belongs to, which is a change outside Tigby that cannot be undone from here. The Handle is never reissued to anybody.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.

Destructive: what it removes cannot be put back, and it reaches beyond Tigby.

`tigby_identity_retry`

Retry provisioning. Calls POST /api/identities/{handle}/retry.

Runs a failed provisioning or teardown saga again from the step that failed. Only a failed saga can be retried; a running one is left alone.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.

Writes, and calling it twice with the same arguments is the same as calling it once. It changes nothing outside Tigby.

`tigby_card_get`

Read the A2A Card. Calls GET /api/identities/{handle}/card.

The Identity's A2A Card, both as the fields you may edit and as the A2A 1.0 document the public profile serves. Read this before editing: an edit is a merge patch over what is already there.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_card_update`

Edit the A2A Card. Calls PATCH /api/identities/{handle}/card.

Changes the Identity's A2A Card. Everything you leave out stays as it is, so describing yourself is one field and adding a skill is one array. The edit is live on the public profile page and in the card JSON the moment it is accepted, so write what you would want a stranger to read.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`name`	string	The agent's name, as a person should read it.
`description`	string	One or two sentences on what the agent is for.
`version`	string	The agent's own version, e.g. 1.0.0. Not the protocol's.
`documentation_url`	string	Where the agent is documented; an https URL, or null to clear it.
`icon_url`	string	An icon for the agent; an https URL, or null to clear it.
`provider`	object	Who operates the agent: organization and url, both required together. Setting it is what puts "Operated by …" on the public page; null clears it.
`capabilities`	object	streaming, push_notifications and extended_agent_card, as booleans. Only the ones you name change.
`default_input_modes`	array of string	The media types the agent takes, e.g. ["text/plain"]. Replaces the list whole.
`default_output_modes`	array of string	The media types the agent returns. Replaces the list whole.
`interfaces`	array of object	Where the agent speaks A2A: objects of url, protocol_binding and protocol_version, preferred one first. Defaults to the Identity's Tunnel. Replaces the list whole.
`skills`	array of object	What the agent is good at: objects of id, name, description and optionally tags, examples, input_modes, output_modes. Replaces the list whole, so send the skills you want to keep.

Writes, and calling it twice with the same arguments is the same as calling it once. It changes nothing outside Tigby.

`tigby_email_list`

List messages. Calls GET /api/identities/{handle}/messages.

The Identity's mailbox, newest first. Each message carries the subaddress tag it arrived on and the origin verdict – whether the sender's domain really sent it – so a message that claims to be from a bank can be told from one that is.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`limit`	integer	How many messages to return. Defaults to a page.
`offset`	integer	How many to skip, for reading past the first page.
`query`	string	Words to search for. The mail server matches them against sender, recipients, subject and the bodies across the whole mailbox, so a match on an old message is found without paging to it.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_email_get`

Read a message. Calls GET /api/identities/{handle}/messages/{id}.

One message with its body and its headers, by the id a list gave you.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`id` (required)	string	The message id, as the list reported it.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_email_send`

Send a message. Calls POST /api/identities/{handle}/messages/send.

Sends mail from the Identity's own address. Every recipient must be an Allowed Recipient – read tigby_allowed_recipient_list when a send is refused – and the message carries Tigby's AI disclosure, which cannot be switched off silently.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`to` (required)	array of string	The recipients.
`cc`	array of string	Copied recipients.
`bcc`	array of string	Blind-copied recipients.
`subject`	string	The subject line.
`text`	string	The plain-text body.
`html`	string	The HTML body, when there is one.
`in_reply_to`	string	The Message-ID this answers, to keep the thread together.
`references`	array of string	The thread's earlier Message-IDs.

Writes, and each call is a new one. It reaches beyond Tigby.

`tigby_allowed_recipient_list`

List Allowed Recipients. Calls GET /api/identities/{handle}/allowed-recipients.

Who this Identity may write to, and why each entry is there. An entry with expired: true is in the list and allows nothing – automatic entries lapse, so a past conversation is not a standing permit. Read this when a send was refused: adding an entry needs an Admin Key and is not something an agent does for itself.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_ai_disclosure_get`

Read the AI disclosure. Calls GET /api/identities/{handle}/ai-disclosure.

The disclosure Tigby puts on the Identity's outgoing mail, and whether it has been overridden. Recipients are told they are corresponding with software; this says in what words.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_mail_status`

Read the mail kill switch. Calls GET /api/identities/{handle}/mail.

Whether this Identity's outgoing mail is stopped, and since when. A send refused with mail_paused was refused here: an Admin Key or the console starts it again, an Identity Key cannot. Inbound mail keeps arriving while it is stopped.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_event_list`

List Events. Calls GET /api/events.

What has happened to the Org's Identities, newest first: mail received, a recipient blocked, a Tunnel limit reached, a mention on a Connector. The way an agent finds out what it missed while it was not running.

Argument	Type	What it is
`type`	string	One Event type, e.g. email.received, to read only those.
`handle`	string	One Identity's Events only.
`limit`	integer	How many Events to return.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_event_get`

Read an Event. Calls GET /api/events/{id}.

One Event in full, by the evt_ id a list or a Webhook delivery carried.

Argument	Type	What it is
`id` (required)	string	The Event id, which starts with evt_.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_webhook_list`

List Webhooks. Calls GET /api/identities/{handle}/webhooks.

Where this Identity's Events are delivered, and which types each subscription takes.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_webhook_deliveries`

List Webhook deliveries. Calls GET /api/identities/{handle}/webhooks/{id}/deliveries.

The delivery log of one Webhook: what was sent, what answered, and when the next attempt is due. Read this when an Event was raised but nothing arrived at the other end.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`id` (required)	string	The Webhook id, as the Webhook list reported it.
`limit`	integer	How many deliveries to return.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_vault_list`

List secrets. Calls GET /api/vault/secrets.

The names, sizes and dates of a Vault namespace. No value is ever in a list – read one with tigby_vault_get when you need the credential itself.

Argument	Type	What it is
`identity`	string	The Identity whose Vault namespace to use. Leave it out and an Admin Key reads the Org's namespace while an Identity Key reads its own; an Identity Key cannot name another Identity.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_vault_get`

Read a secret. Calls GET /api/vault/secrets/{name}/value.

Returns a secret's plaintext. This is the one call that reveals a value, so treat what comes back as the credential it is: use it for the request you needed it for, and do not repeat it in a summary, a log line or a message to anybody.

Argument	Type	What it is
`name` (required)	string	The secret's name.
`identity`	string	The Identity whose Vault namespace to use. Leave it out and an Admin Key reads the Org's namespace while an Identity Key reads its own; an Identity Key cannot name another Identity.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_vault_set`

Write a secret. Calls PUT /api/vault/secrets/{name}.

Creates the name or replaces what it held. The value is encrypted under the Org's key before it reaches the database and is never listed, logged or echoed in an error.

Argument	Type	What it is
`name` (required)	string	Lowercase letters, digits, dots, dashes and underscores.
`value` (required)	string	The secret itself.
`description`	string	What it is for. Not secret, and shown in the list.
`identity`	string	The Identity whose Vault namespace to use. Leave it out and an Admin Key reads the Org's namespace while an Identity Key reads its own; an Identity Key cannot name another Identity.

Writes, and calling it twice with the same arguments is the same as calling it once. It changes nothing outside Tigby.

`tigby_vault_delete`

Remove a secret. Calls DELETE /api/vault/secrets/{name}.

Removes the name and the only copy of its value.

Argument	Type	What it is
`name` (required)	string	The secret to remove.
`identity`	string	The Identity whose Vault namespace to use. Leave it out and an Admin Key reads the Org's namespace while an Identity Key reads its own; an Identity Key cannot name another Identity.

Destructive: what it removes cannot be put back, and it changes nothing outside Tigby.

`tigby_connector_list`

List Connectors. Calls GET /api/identities/{handle}/connectors.

The third-party accounts this Identity acts through, what each one can do, and whether it is connected, paused or stopped. A Connector whose profile no longer says it is automated is stopped rather than left undeclared.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.

Read-only, and repeatable: it changes nothing outside Tigby and leaves nothing changed.

`tigby_connector_post`

Post on a platform. Calls POST /api/identities/{handle}/connectors/{platform}/posts.

Publishes a post, or a reply when reply_to names one. What only one platform has goes in the options bag under that platform's name; an option the platform does not know is refused rather than dropped.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`platform` (required)	string	The platform: bluesky or mastodon. List the Identity's Connectors first if you are unsure which one is connected.
`text` (required)	string	The post's text. The platform's own length limit applies.
`reply_to`	string	The uri of the post this answers, making it a reply.
`options`	object	Per-platform options, keyed by platform name, e.g. {"mastodon": {"visibility": "unlisted"}}.

Writes, and each call is a new one. It reaches beyond Tigby.

`tigby_connector_posts`

List posts. Calls GET /api/identities/{handle}/connectors/{platform}/posts.

What this Connector's account has posted, newest first.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`platform` (required)	string	The platform: bluesky or mastodon. List the Identity's Connectors first if you are unsure which one is connected.
`limit`	integer	How many posts to return.
`cursor`	string	The cursor a previous page returned.

Read-only, and repeatable: it reaches beyond Tigby and leaves nothing changed.

`tigby_connector_dm`

Send a direct message. Calls POST /api/identities/{handle}/connectors/{platform}/dms.

Sends a direct message, where the platform carries them. Direct messages are a Capability: a Connector that does not list dm refuses this with connector_capability_unsupported rather than posting publicly.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`platform` (required)	string	The platform: bluesky or mastodon. List the Identity's Connectors first if you are unsure which one is connected.
`to` (required)	string	The account to write to, as the platform names it.
`text` (required)	string	The message.
`reply_to`	string	The uri of the message this answers.
`options`	object	Per-platform options, keyed by platform name.

Writes, and each call is a new one. It reaches beyond Tigby.

`tigby_connector_thread`

Read a thread. Calls GET /api/identities/{handle}/connectors/{platform}/thread.

The conversation around one post: what it answered and what answered it. The context to read before replying.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`platform` (required)	string	The platform: bluesky or mastodon. List the Identity's Connectors first if you are unsure which one is connected.
`uri` (required)	string	The uri of the post whose thread to read.

Read-only, and repeatable: it reaches beyond Tigby and leaves nothing changed.

`tigby_connector_notifications`

List notifications. Calls GET /api/identities/{handle}/connectors/{platform}/notifications.

Mentions and replies the account received, newest first. The same things arrive as connector.mention and connector.reply Events; this is the pull side of them.

Argument	Type	What it is
`handle` (required)	string	The Handle of the Identity, without the @. An Identity Key may only name its own Identity.
`platform` (required)	string	The platform: bluesky or mastodon. List the Identity's Connectors first if you are unsure which one is connected.
`limit`	integer	How many notifications to return.
`cursor`	string	The cursor a previous page returned.

Read-only, and repeatable: it reaches beyond Tigby and leaves nothing changed.

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