MCP Tools Reference: agentregistry.googleapis.com

Tool: create_binding

Create a new binding between an agent and another resource (agent, MCP server, or endpoint).

The following sample demonstrate how to use curl to invoke the create_binding MCP tool.

Curl Request 
                  
curl --location 'https://agentregistry.googleapis.com/mcp' \
--header 'content-type: application/json' \
--header 'accept: application/json, text/event-stream' \
--data '{
  "method": "tools/call",
  "params": {
    "name": "create_binding",
    "arguments": {
      // provide these details according to the tool's MCP specification
    }
  },
  "jsonrpc": "2.0",
  "id": 1
}'

Input Schema

Message for creating a Binding

CreateBindingRequest

JSON representation 
{
  "parent": string,
  "bindingId": string,
  "binding": {
    object (Binding)
  },
  "requestId": string
}
Fields
parent

string

Required. The project and location to create the Binding in. Expected format: projects/{project}/locations/{location}.
bindingId

string

Required. The ID to use for the binding, which will become the final component of the binding's resource name.

This value should be 4-63 characters, and must conform to RFC-1034. Specifically, it must match the regular expression ^[a-z]([a-z0-9-]{0,61}[a-z0-9])?$.
binding

object (Binding)

Required. The Binding resource that is being created.
requestId

string

Optional. An optional request ID to identify requests. Specify a unique request ID so that if you must retry your request, the server will know to ignore the request if it has already been completed. The server will guarantee that for at least 60 minutes since the first request.

For example, consider a situation where you make an initial request and the request times out. If you make the request again with the same request ID, the server can check if original operation with the same request ID was received, and if so, will ignore the second request. This prevents clients from accidentally creating duplicate commitments.

The request ID must be a valid UUID with the exception that zero UUID is not supported (00000000-0000-0000-0000-000000000000).

Binding

JSON representation 
{
  "name": string,
  "displayName": string,
  "description": string,
  "source": {
    object (Source)
  },
  "target": {
    object (Target)
  },
  "createTime": string,
  "updateTime": string,

  // Union field binding can be only one of the following:
  "authProviderBinding": {
    object (AuthProviderBinding)
  }
  // End of list of possible types for union field binding.
}
Fields
name

string

Required. Identifier. The resource name of the Binding. Format: projects/{project}/locations/{location}/bindings/{binding}.
displayName

string

Optional. User-defined display name for the Binding. Can have a maximum length of 63 characters.
description

string

Optional. User-defined description of a Binding. Can have a maximum length of 2048 characters.
source

object (Source)

Required. The target Agent of the Binding.
target

object (Target)

Required. The target Agent Registry Resource of the Binding.
createTime

string (Timestamp format)

Output only. Timestamp when this binding was created.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".
updateTime

string (Timestamp format)

Output only. Timestamp when this binding was last updated.

Uses RFC 3339, where generated output will always be Z-normalized and use 0, 3, 6 or 9 fractional digits. Offsets other than "Z" are also accepted. Examples: "2014-10-02T15:01:23Z", "2014-10-02T15:01:23.045123456Z" or "2014-10-02T15:01:23+05:30".
Union field binding. The configuration for the Binding. binding can be only one of the following:
authProviderBinding

object (AuthProviderBinding)

The binding for AuthProvider.

AuthProviderBinding

JSON representation 
{
  "authProvider": string,
  "scopes": [
    string
  ],
  "continueUri": string
}
Fields
authProvider

string

Required. The resource name of the target AuthProvider. Format:

  • projects/{project}/locations/{location}/authProviders/{auth_provider}
scopes[]

string

Optional. The list of OAuth2 scopes of the AuthProvider.
continueUri

string

Optional. The continue URI of the AuthProvider. The URI is used to reauthenticate the user and finalize the managed OAuth flow.

Source

JSON representation 
{

  // Union field source_type can be only one of the following:
  "identifier": string
  // End of list of possible types for union field source_type.
}
Fields
Union field source_type. The type of the source, currently only supports Agents. Potential future fields include 'tag', etc. source_type can be only one of the following:
identifier

string

The identifier of the source Agent. Format:

  • urn:agent:{publisher}:{namespace}:{name}

Target

JSON representation 
{

  // Union field target_type can be only one of the following:
  "identifier": string
  // End of list of possible types for union field target_type.
}
Fields
Union field target_type. The type of the target, currently only supports an AgentRegistry Resource. Potential future fields include 'tag', etc. target_type can be only one of the following:
identifier

string

The identifier of the target Agent, MCP Server, or Endpoint. Format:

  • urn:agent:{publisher}:{namespace}:{name}
  • urn:mcp:{publisher}:{namespace}:{name}
  • urn:endpoint:{publisher}:{namespace}:{name}

Timestamp

JSON representation 
{
  "seconds": string,
  "nanos": integer
}
Fields
seconds

string (int64 format)

Represents seconds of UTC time since Unix epoch 1970-01-01T00:00:00Z. Must be between -62135596800 and 253402300799 inclusive (which corresponds to 0001-01-01T00:00:00Z to 9999-12-31T23:59:59Z).
nanos

integer

Non-negative fractions of a second at nanosecond resolution. This field is the nanosecond portion of the duration, not an alternative to seconds. Negative second values with fractions must still have non-negative nanos values that count forward in time. Must be between 0 and 999,999,999 inclusive.

Output Schema

This resource represents a long-running operation that is the result of a network API call.

Operation

JSON representation 
{
  "name": string,
  "metadata": {
    "@type": string,
    field1: ...,
    ...
  },
  "done": boolean,

  // Union field result can be only one of the following:
  "error": {
    object (Status)
  },
  "response": {
    "@type": string,
    field1: ...,
    ...
  }
  // End of list of possible types for union field result.
}
Fields
name

string

The server-assigned name, which is only unique within the same service that originally returns it. If you use the default HTTP mapping, the name should be a resource name ending with operations/{unique_id}.
metadata

object

Service-specific metadata associated with the operation. It typically contains progress information and common metadata such as create time. Some services might not provide such metadata. Any method that returns a long-running operation should document the metadata type, if any.

An object containing fields of an arbitrary type. An additional field "@type" contains a URI identifying the type. Example: { "id": 1234, "@type": "types.example.com/standard/id" }.
done

boolean

If the value is false, it means the operation is still in progress. If true, the operation is completed, and either error or response is available.
Union field result. The operation result, which can be either an error or a valid response. If done == false, neither error nor response is set. If done == true, exactly one of error or response can be set. Some services might not provide the result. result can be only one of the following:
error

object (Status)

The error result of the operation in case of failure or cancellation.
response

object

The normal, successful response of the operation. If the original method returns no data on success, such as Delete, the response is google.protobuf.Empty. If the original method is standard Get/Create/Update, the response should be the resource. For other methods, the response should have the type XxxResponse, where Xxx is the original method name. For example, if the original method name is TakeSnapshot(), the inferred response type is TakeSnapshotResponse.

An object containing fields of an arbitrary type. An additional field "@type" contains a URI identifying the type. Example: { "id": 1234, "@type": "types.example.com/standard/id" }.

Any

JSON representation 
{
  "typeUrl": string,
  "value": string
}
Fields
typeUrl

string

Identifies the type of the serialized Protobuf message with a URI reference consisting of a prefix ending in a slash and the fully-qualified type name.

Example: type.googleapis.com/google.protobuf.StringValue

This string must contain at least one / character, and the content after the last / must be the fully-qualified name of the type in canonical form, without a leading dot. Do not write a scheme on these URI references so that clients do not attempt to contact them.

The prefix is arbitrary and Protobuf implementations are expected to simply strip off everything up to and including the last / to identify the type. type.googleapis.com/ is a common default prefix that some legacy implementations require. This prefix does not indicate the origin of the type, and URIs containing it are not expected to respond to any requests.

All type URL strings must be legal URI references with the additional restriction (for the text format) that the content of the reference must consist only of alphanumeric characters, percent-encoded escapes, and characters in the following set (not including the outer backticks): /-.~_!$&()*+,;=. Despite our allowing percent encodings, implementations should not unescape them to prevent confusion with existing parsers. For example, type.googleapis.com%2FFoo should be rejected.

In the original design of Any, the possibility of launching a type resolution service at these type URLs was considered but Protobuf never implemented one and considers contacting these URLs to be problematic and a potential security issue. Do not attempt to contact type URLs.
value

string (bytes format)

Holds a Protobuf serialization of the type described by type_url.

A base64-encoded string.

Status

JSON representation 
{
  "code": integer,
  "message": string,
  "details": [
    {
      "@type": string,
      field1: ...,
      ...
    }
  ]
}
Fields
code

integer

The status code, which should be an enum value of google.rpc.Code.
message

string

A developer-facing error message, which should be in English. Any user-facing error message should be localized and sent in the google.rpc.Status.details field, or localized by the client.
details[]

object

A list of messages that carry the error details. There is a common set of message types for APIs to use.

An object containing fields of an arbitrary type. An additional field "@type" contains a URI identifying the type. Example: { "id": 1234, "@type": "types.example.com/standard/id" }.

Tool Annotations

Destructive Hint: ✅ | Idempotent Hint: ❌ | Read Only Hint: ❌ | Open World Hint: ❌