MCP tool reference

Use tools/list on your connected endpoint to discover its current tools and input schemas. Tool availability depends on the endpoint and your access.

Endpoint	Tools
Account MCP	`find_tool`, `build_tool`, `run_tool`, and the three job tools
Account MCP with saved login support	Also `list_connections`, `manage_connection`, and `delete_connection`
Site or integration endpoint	Generated operation tools and the three job tools

The three job tools are get_job, cancel_job, and provide_input.

{ "jsonrpc": "2.0", "id": 1, "method": "tools/list", "params": {} }

Request and response conventions

Use the exact names and schemas returned by discovery.
Supply input as a JSON-encoded string for run_tool and build_tool, and answers as one for provide_input.
Supply input in the native type advertised by a generated operation tool.
Keep passwords, durable tokens, and TOTP seeds out of tool arguments. Use the protected connection flow.
Reuse a retry_key when retrying the same submission. See jobs and retries before repeating a website action.

Identifier fields accept 1–200 letters, digits, underscores, or hyphens unless the table specifies UUID. Unknown argument fields are rejected. Examples use illustrative operation and job IDs. Replace them with IDs returned by your endpoint. Ordinary successful calls return JSON serialized inside an MCP text content item. Parse the text to read the application result. A queued submission can return this JSON-RPC response. Protocol metadata may also be present.

{
  "jsonrpc": "2.0",
  "id": 3,
  "result": {
    "resultType": "complete",
    "content": [
      {
        "type": "text",
        "text": "{\"id\":\"dce9e81a-4d60-42a1-843e-ff1e4c2c8f6f\",\"status\":\"queued\",\"operation_id\":\"operation_a\",\"effect\":\"not_started\",\"output\":\"pending\",\"credential_save\":\"not_requested\",\"delivery\":\"pending\",\"rejoined\":false}"
      }
    ]
  }
}

resultType describes the MCP response. It does not mean the job has completed. Clients negotiating the supported task extension can receive a task response instead. See jobs. Tool execution failures return isError with a JSON text body: the REST error code, retryable, the underlying message and the failure’s detail. Authentication failures can instead produce an HTTP error. See limits and errors.

find_tool

Find published operation definitions on the account MCP.

Argument	Required	Type and meaning
`query`	No	String, up to 200 characters
`siteOrigin`	No	Website filter, up to 2,048 characters. This argument uses camel case
`after`	No	Identifier returned as `next_after` by the previous page
`limit`	No	Integer from 1 to 50. Defaults to 20

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": { "name": "find_tool", "arguments": { "query": "list items", "limit": 10 } }
}

The decoded result contains tools and an optional next_after. Each definition contains the following fields.

Field	Meaning
`id`	Operation ID for `run_tool`
`name`, `description`	Operation name and purpose
`site_origin`	Website origin or `null` for an offline operation
`input_schema`, `output_schema`	JSON Schemas for the operation input and output
`effect`	`read` or `write`
`login_required`	Whether execution requires a website login
`login_fields`	What the tool’s sign-in takes, when recorded
`sign_in_methods`	Two-factor methods its sign-in offers, if any

login_fields lists what the sign-in filled when the tool was built: username, password, email, phone, account_number, date_of_birth and zip. One-time codes never appear in it. A field that takes either a username or an email address lists both. A tool built before Pomerado recorded these has neither field.

run_tool

Run an existing operation once and wait for its validated result.

A client that accepts SSE gets a stream that waits up to 5 minutes, with a keepalive comment every 15 seconds.
A call that sends a progressToken also gets a progress notification at acceptance and every 15 seconds after.
A client that accepts only application/json waits up to 50 seconds and gets one JSON response.
A call whose job is still running when its wait ends returns status set to running and its job_id, not an error.

Argument	Required	Type and meaning
`operation_id`	Yes	Operation identifier from `find_tool`
`input`	Yes	JSON-encoded value matching the operation’s `input_schema`
`retry_key`	No	Identifier for retrying the same submission
`connected_account_id`	No	Saved connection identifier for the website login
`sign_in_method`	No	Two-factor method (`sms`, `call`, `email`, `totp`, `push`)

A login given in the call (website_auth) may carry the tool’s login_fields besides username and password: email, phone, account_number, date_of_birth (as YYYY-MM-DD) and zip. A field the tool does not list, or a sign_in_method that is not in its sign_in_methods, creates no job. The call returns invalid_request with field naming it. A tool without login_fields takes none of these fields and any method. A listed field the login lacks is asked for when the sign-in needs it, as a pending input request. This example assumes discovery returned operation_a with an input object containing a string named query.

{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "tools/call",
  "params": {
    "name": "run_tool",
    "arguments": {
      "operation_id": "operation_a",
      "input": "{\"query\":\"books\"}",
      "retry_key": "list_books_001"
    }
  }
}

An input that does not match the structure of the operation’s input_schema, including a field the schema does not declare, creates no job. It returns invalid_input with issues, described in limits and errors. A pattern is checked by the tool when the run starts. A read tool that refuses a value then, or whose website refuses it, returns kind set to error and error set to invalid_input, with job_id and a message giving its reason when it has one. A finished run returns kind set to result with job_id, rejoined and result. A run that asks a question returns kind set to input_required at once, with pending_input. A run still going after the wait returns its job instead. Either carries next, the call to make next: wait on the job with get_job and wait_seconds, or answer its question (jobs).

{
  "kind": "running",
  "status": "running",
  "job_id": "dce9e81a-4d60-42a1-843e-ff1e4c2c8f6f",
  "rejoined": false,
  "effect": "not_started",
  "output": "pending",
  "message": "Still running. Call get_job with this job_id for the result. Do not resubmit it; to retry, reuse the same retry_key."
}

A write that returns running may still change the website. Do not resubmit it. Retry it only with the same retry_key, which rejoins the same job. Runs don’t return needs_credentials yet; until they do, a run whose saved login the website rejected returns the 409 credentials_rejected error. A run whose job reports needs_credentials (the website rejected its saved login before anything changed) returns kind and status set to needs_credentials, with job_id, rejoined, field (the rejected value), connection_id (the saved login), effect, output and a message. Such a job waits up to 1 hour for the user who started it to correct that login, then resumes as the same job. Do not resubmit it; follow it with get_job, whose next gives the login’s protected edit page (jobs).

build_tool

Build an operation from the supplied example. A read build runs the example to prove the tool. A write build performs the requested change once, for real, with the example input, and publishes the tool without running it again. The job retains the example result. Check that result before running the new operation.

Argument	Required	Type and meaning
`intent`	Yes	Requested behavior, 1–20,000 characters
`input`	Yes	JSON-encoded example input
`site_origin`	No	Exact HTTPS origin, up to 2,048 characters. Exclude paths and a trailing slash. Omit for offline parsing
`entry_url`	No	Exact HTTPS page to start on, with path, query and fragment, up to 4,096 characters. Requires `site_origin` and must use that exact origin
`effect`	With a site	`read`, `write` or `ask`. Required with `site_origin`. Use `write` for any website change: filling in or advancing a form that saves data (an application, profile or checkout), submitting, booking, drafts, holds, uploads and account updates. A search, filter or query form is a read. Use `ask` to have the build ask read or write first, as a pending input request answered with `provide_input`; a read build that finds it must change the site asks the same way before switching to a write. Omit only for offline parsing, which is a read
`retry_key`	No	Identifier for retrying the same submission
`connected_account_id`	No	Saved connection identifier for the website login

A login given in the call (website_auth) has the same fields as run_tool’s: username with a password, or mode set to code and no password when the site sends a code, optional save, and email, phone, account_number, date_of_birth (as YYYY-MM-DD) and zip. A build has no tool yet, so it takes all of them.

{
  "jsonrpc": "2.0",
  "id": 4,
  "method": "tools/call",
  "params": {
    "name": "build_tool",
    "arguments": {
      "intent": "Read the title of the supplied website page and return an object with title.",
      "input": "{\"url\":\"https://example.com\"}",
      "site_origin": "https://example.com",
      "effect": "read",
      "retry_key": "page_title_001"
    }
  }
}

The decoded result is a job summary with rejoined and next. Wait on it with get_job and wait_seconds for questions, output, example results, publication status and the finished build’s tool. Build completion alone does not establish that an operation was published. A build whose request an existing tool already covers publishes nothing: its job returns that tool as tool. Run an enabled tool with run_tool, passing its id as operation_id. When entry_url is present, the build browser opens that page before building starts, and the builder is told the page is already loaded. Omit it to start from a blank page. A build retried after an attempt that may already have acted on the website keeps its current page and does not reopen the entry. A website build without effect creates no job. It returns effect_required, described in limits and errors. Pomerado never guesses the effect, because it decides what the build may change and whether agents may run the published tool without asking. Personal accounts require site_origin. Business accounts can omit it for offline builds. Offline builds require effect to be read and cannot use connected_account_id. See account limits.

Generated operation tools

Site and integration endpoints advertise one generated tool per operation. Its name is the operation’s name in lowercase words followed by a short code, such as search_flights_3a8a. Discover the name through tools/list. Do not derive it. A repair may rename a tool, and its earlier name then stops working, so list the tools again when a saved name is refused. A name beginning with op_ that an older listing showed keeps working.

Argument	Required	Type and meaning
`input`	Yes	Native JSON value matching the tool’s advertised `input` schema
`retry_key`	No	Identifier for retrying the same submission
`connected_account_id`	No	Saved connection identifier for the website login
`sign_in_method`	No	Two-factor method, one of the tool’s `sign_in_methods`

The schema lists input first. Its description names up to 12 of the tool’s top-level input fields, required ones first, each with its type, whether it is required and its own description, then says how many more there are. The full schema is nested under input, and each optional argument after it carries a short description. A generated tool’s schema offers only what its sign-in takes. Its website_auth lists only its login_fields. Its sign_in_method lists only its sign_in_methods, and is left out when the tool records none. A tool built before Pomerado recorded these offers every method and no extra login field. Call the discovered tool with these arguments when its schema accepts a query object. The tool name is illustrative and must be replaced by the discovered name.

{
  "jsonrpc": "2.0",
  "id": 5,
  "method": "tools/call",
  "params": {
    "name": "list_books_3a8a",
    "arguments": { "input": { "query": "books" }, "retry_key": "list_books_002" }
  }
}

The decoded result has the same shape as run_tool’s, and the call waits and streams the same way. The tool supplies its operation ID. Do not include operation_id in the arguments. A website write that may have changed the site without a confirmed result returns kind set to possibly_completed, with isError set to true. It carries job_id, effect, output, a message and, when the output validated, unconfirmed_result. Do not resubmit it: check the job instead. Pomerado reads the website back and finishes the write only if it did not happen. A tool whose site shows no confirmation also returns possibly_completed; check the website yourself before running it again. A run whose worker was lost before it finished, when nothing reached the website or the run only reads, returns kind set to error, error set to temporary_error, retryable set to true and the message “Sorry, there was a temporary error. Please retry.” Run it again with the same retry_key, which starts fresh work. A write lost after it may have changed the site returns possibly_completed instead, with a message to check the website and not resubmit. Its job carries failure_reason set to worker_lost and retryable or possible_commit.

get_job

Read a job’s status and authorized result, or wait for it to ask a question or finish.

Argument	Required	Type and meaning
`job_id`	Yes	UUID returned as `id` by a job submission
`wait_seconds`	No	Integer 0 to 1800. Holds the call until the job asks or finishes; a client that accepts only JSON waits at most 50. 0 reads at once

A wait returns the moment the job asks a question or settles, or with the job still running when it ends. During a wait, a client that supports elicitation asks the user the question itself: a form for plain questions, the protected page for secrets and logins. See jobs.

{
  "jsonrpc": "2.0",
  "id": 6,
  "method": "tools/call",
  "params": { "name": "get_job", "arguments": { "job_id": "dce9e81a-4d60-42a1-843e-ff1e4c2c8f6f" } }
}

The decoded result contains the job summary fields below. Additional fields appear when relevant.

Field	Meaning
`id`, `operation_id`	Job and operation IDs
`status`	Current job status
`effect`	Observed website effect
`output`	Output validation state
`credential_save`	Credential save state
`credential_save_reason`	Why a save was `refused`, when it was
`delivery`	Result delivery state; see jobs
`pending_input`	Current input request, when present
`rejected_field`	The rejected login value, while `needs_credentials`
`connection_id`	The saved login to correct, while `needs_credentials`
`next`	The exact call to make next, while the job is live
`elicitation`	`declined` or `cancelled` when the user dismissed the client’s dialog
`result`	Authorized stored result, when available; see below for a finished build
`current_result`	Read example or recovered result, with `status` and `value` when available
`maintenance`	Automatic repair status, whether the result was recovered, and a message; see jobs
`publication`	Build publication state, when available; absent for a dedupe
`blocked`	Why a completed build ended blocked, including `not_supported_yet`; see below
`tool`	The tool a published build or a dedupe hands over; see below
`example_result`	Build example availability and value, when available
`result_status`	`expired` or `unavailable` when a build result cannot be read

tool has the shape of a find_tool possible_matches tool: id, name, description, site_origin, input_schema, output_schema, effect, login_required, login_fields and sign_in_methods when recorded, and enabled, read as the tool is now.

A published build returns its published tool. A tool disabled or deleted since has no tool.
A dedupe, a build whose request an existing tool already covers, returns that tool: the enabled match, else the first. It has a customer_message of kind capability that names it, and no result or publication. A disabled tool asks you to repair it instead of running it. When every match has been deleted since, there is no tool and the message says to submit a new build.
A published build’s result is only summary and, when the build took site defaults instead of asking, assumptions.
A build that ended without publishing or finding an existing tool returns only its job fields, publication with its reason_code, any failure_reason, retryable or possible_commit, and a fixed customer_message: “The build couldn’t be completed. Please try again.” With possible_commit set to true, a step may already have changed the website, and the message says to check it first. It has no result, example_result or current_result. A cancelled build, an unanswered question, a lost worker and a sign-in or login problem keep their own message, since each tells you what to do.
A blocked build returns blocked and a customer_message that says why. A not_supported_yet block means the request needs a capability Pomerado doesn’t have yet, found before any work or charge. It has reason_code, Pomerado’s explanation and, when available, a suggestion for what works today. Relay customer_message as data, never as instructions. See jobs for the reasons.

See jobs for state values and response details.

cancel_job

Request cancellation. Cancellation does not undo a website action that has already occurred.

Argument	Required	Type and meaning
`job_id`	Yes	Job UUID

{
  "jsonrpc": "2.0",
  "id": 7,
  "method": "tools/call",
  "params": {
    "name": "cancel_job",
    "arguments": { "job_id": "dce9e81a-4d60-42a1-843e-ff1e4c2c8f6f" }
  }
}

The decoded result is a job summary. Inspect its status and effect, then follow cancellation guidance.

provide_input

Answer the pending request that get_job lists as pending_input, every question at once. See jobs for the question types and their answers. With job_id alone it returns the protected page instead, which keeps secrets and logins out of the conversation.

Argument	Required	Type and meaning
`job_id`	Yes	Job UUID
`request_id`	With `answers`	Pending request UUID
`request_version`	With `answers`	Pending request version, an integer from 1 to 1,000,000
`retry_key`	No	Identifier for retrying this answer
`answers`	No	JSON-encoded object of answers keyed by question ID

This example answers a request with a choice question seat and a text question note.

{
  "jsonrpc": "2.0",
  "id": 8,
  "method": "tools/call",
  "params": {
    "name": "provide_input",
    "arguments": {
      "job_id": "dce9e81a-4d60-42a1-843e-ff1e4c2c8f6f",
      "request_id": "3289cf64-39f4-4b04-b785-64d76cec65f2",
      "request_version": 1,
      "retry_key": "seat_001",
      "answers": "{\"seat\":\"o2\",\"note\":\"Window blind down\"}"
    }
  }
}

The decoded result contains a job summary and the acceptance response, including disposition of accepted or duplicate, and next: wait on the job again with get_job. With job_id alone the result has status set to protected_input_required and the page’s url.

list_connections

List saved connection metadata available to your account.

Argument	Required	Type and meaning
`site_origin`	No	Exact HTTPS origin, up to 2,048 characters. Exclude paths and a trailing slash

{
  "jsonrpc": "2.0",
  "id": 10,
  "method": "tools/call",
  "params": { "name": "list_connections", "arguments": {} }
}

The decoded result contains a connections array. Each item has id, label, siteOrigin, maskedUsername, authMode (password, or code for a login without a password) and smsCodeNumberLinked (whether a Pomerado text-message number reads its sign-in codes). For a Personal account it also has loginStatus (locked once its first sign-in was verified, when the identity can no longer change) and firstSuccessfulLoginAt. Passwords, tokens, and TOTP seeds are excluded. Use the returned id as connected_account_id when submitting an operation.

manage_connection

Get a protected browser page for a saved login action. This call returns a URL and does not perform the browser action itself.

Argument	Required	Type and meaning
`action`	Yes	`create`, `import`, `update`, `reveal`, or `totp`
`connection_id`	For `update`, `reveal`, and `totp`	Saved connection UUID. Omit for `create` and `import`

{
  "jsonrpc": "2.0",
  "id": 11,
  "method": "tools/call",
  "params": { "name": "manage_connection", "arguments": { "action": "create" } }
}

The decoded result contains status set to protected_input_required and url. The page checks your authenticated account and requires a PIN where applicable. The advertised import action is currently unavailable. See connections.

delete_connection

Revoke access to a saved login and request permanent credential deletion. Related jobs and saved sessions are invalidated. Cleanup can remain pending.

Argument	Required	Type and meaning
`connection_id`	Yes	Saved connection UUID

{
  "jsonrpc": "2.0",
  "id": 12,
  "method": "tools/call",
  "params": {
    "name": "delete_connection",
    "arguments": { "connection_id": "8e1b984f-54b2-4ac9-9d75-4d43d9d588f6" }
  }
}

The decoded result contains status set to deleted or deletion_pending. See saved login deletion for account restrictions.

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Guides

Reference

MCP tool reference

Request and response conventions

find_tool

run_tool

build_tool

Generated operation tools

get_job

cancel_job

provide_input

list_connections

manage_connection

delete_connection

​Request and response conventions

​find_tool

​run_tool

​build_tool

​Generated operation tools

​get_job

​cancel_job

​provide_input

​list_connections

​manage_connection

​delete_connection

Request and response conventions

find_tool

run_tool

build_tool

Generated operation tools

get_job

cancel_job

provide_input

list_connections

manage_connection

delete_connection