MCP Tools Reference: chronicle.googleapis.com

Tool: evaluate_rule_coverage_long_running

Evaluates rule coverage for a given set of synthetic UDM events by ingesting them into the customer environment and initiating evaluation.

Input Requirements: - threat_detection_opportunity_events: A list of objects containing threat_detection_opportunity_id and udms_json. - threat_detection_opportunity_id is REQUIRED for each entry. This ID exists in the TDO object returned by the generate_threat_detection_opportunity tool. - exclude_composite_coverage: Optional boolean. Set to true to exclude composite rules from running, which can help reduce coverage evaluation time.

Workflow Integration & Order of Operations: - This tool MUST be called AFTER ALL synthetic logs are generated for ALL TDOs using generate_synthetic_events. Do not call this tool while synthetic log generation is still in progress for other TDOs. - Once all synthetic events are ready, bundle them into threat_detection_opportunity_events and call this tool once to initiate the coverage evaluation.

Instructions for Polling with get_operation: - This tool returns a google.longrunning.Operation object containing an operation name (e.g., projects/.../operations/dea-12345) and done: false. - You MUST use the get_operation tool, passing the returned name as the name parameter, to poll for completion. - Poll get_operation periodically (once a minute) until done is true. - When done is true, the result.response field in the operation will contain an EvaluateRuleCoverageLongRunningResponse object. - EvaluateRuleCoverageLongRunningResponse contains coverage_results: a list of EvaluatedRuleCoverageResult objects (each having matched_rule, feedback_id, and threat_detection_opportunity_id). - Inspect coverage_results to determine which rules matched which TDOs. If coverage_results is empty for a TDO, there is a coverage gap and you should call generate_rules next.

Example Usage: - evaluate_rule_coverage_long_running(project_id='my-project', region='us', customer_id='my-instance', threat_detection_opportunity_events=[{'threat_detection_opportunity_id': 'tdo-123', 'udms_json': ['{"metadata": {"event_timestamp": "2023-10-27T10:00:00Z"}}']}], exclude_composite_coverage=true)

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

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

Input Schema

Request message for EvaluateRuleCoverageLongRunning.

EvaluateRuleCoverageLongRunningRequest

JSON representation 
{
  "projectId": string,
  "customerId": string,
  "region": string,
  "threatDetectionOpportunityEvents": [
    {
      object (ThreatDetectionOpportunityEvents)
    }
  ],
  "excludeCompositeCoverage": boolean
}
Fields
projectId

string

Required. Google Cloud project ID.
customerId

string

Required. Chronicle customer ID.
region

string

Required. Chronicle region (e.g., "us", "europe").
threatDetectionOpportunityEvents[]

object (ThreatDetectionOpportunityEvents)

Required. The TDO events to evaluate rule coverage for.
excludeCompositeCoverage

boolean

Optional. Whether to exclude composite rules from the evaluation.

ThreatDetectionOpportunityEvents

JSON representation 
{
  "threatDetectionOpportunityId": string,
  "udmsJson": [
    string
  ]
}
Fields
threatDetectionOpportunityId

string

Required. The id of the associated Threat Detection Opportunity.
udmsJson[]

string

Required. The input JSON UDM to evaluate all managed content rules against.

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

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