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layout	title	has_children	has_toc	nav_order	parent	grand_parent
default	CAT Index tool	false	false	20	Tools	Agents and tools

CAT Index tool

Introduced 2.12 {: .label .label-purple }

This is an experimental feature and is not recommended for use in a production environment. For updates on the progress of the feature or if you want to leave feedback, see the associated GitHub issue.
{: .warning}

The CatIndexTool retrieves index information for the OpenSearch cluster, similarly to the CAT Indices API.

Step 1: Register a flow agent that will run the CatIndexTool

A flow agent runs a sequence of tools in order and returns the last tool's output. To create a flow agent, send the following register agent request:

POST /_plugins/_ml/agents/_register
{
  "name": "Test_Agent_For_CatIndex_tool",
  "type": "flow",
  "description": "this is a test agent for the CatIndexTool",
  "tools": [
    {
      "type": "CatIndexTool",
      "name": "DemoCatIndexTool",
      "parameters": {
        "input": "${parameters.question}"
      }
    }
  ]
}

{% include copy-curl.html %}

For parameter descriptions, see Register parameters.

OpenSearch responds with an agent ID:

{
  "agent_id": "9X7xWI0Bpc3sThaJdY9i"
}

Step 2: Run the agent

Before you run the agent, make sure that you add the sample OpenSearch Dashboards Sample eCommerce orders dataset. To learn more, see Adding sample data.

Then, run the agent by sending the following request:

POST /_plugins/_ml/agents/9X7xWI0Bpc3sThaJdY9i/_execute
{
  "parameters": {
    "question": "How many indices do I have?"
  }
}

{% include copy-curl.html %}

OpenSearch returns the index information:

{
  "inference_results": [
    {
      "output": [
        {
          "name": "response",
          "result": """health    status    index    uuid    pri    rep    docs.count    docs.deleted    store.size    pri.store.size
green    open    .plugins-ml-model-group    lHgGEgJhT_mpADyOZoXl2g    1    1    9    2    33.4kb    16.7kb
green    open    .plugins-ml-memory-meta    b2LEpv0QS8K60QBjXtRm6g    1    1    13    0    95.1kb    47.5kb
green    open    .ql-datasources    9NXm_tMXQc6s_4uRToSNkQ    1    1    0    0    416b    208b
green    open    sample-ecommerce    UPYOQcAfRGqFAlSxcZlRjw    1    1    40320    0    4.1mb    2mb
green    open    .plugins-ml-task    xYTlprYCQnaaYici69SOjA    1    1    117    0    115.5kb    57.6kb
green    open    .opendistro_security    7DAqhm9QQmeEsQYhA40cJg    1    1    10    0    117kb    58.5kb
green    open    sample-host-health    Na5tq6UiTt6r_qYME1vV-w    1    1    40320    0    2.6mb    1.3mb
green    open    .opensearch-observability    6PthtLluSKyYCdZR3Mw0iw    1    1    0    0    416b    208b
green    open    .plugins-ml-model    WYcjBHcnRuSDHeVWPVupoA    1    1    191    45    4.2gb    2.1gb
green    open    index_for_neural_sparse    GQswGabQRIazM_trnqaDrw    1    1    5    0    28.4kb    14.2kb
green    open    security-auditlog-2024.01.30    BhXR7Nd3QVOVGxJNpR0-jw    1    1    27768    0    13.8mb    7mb
green    open    sample-http-responses    0gmYYYdOTiCbVUvl_uDL0w    1    1    40320    0    2.5mb    1.2mb
green    open    security-auditlog-2024.02.01    2VD1ieDGS5m-TfjIdfT8Eg    1    1    39305    0    39mb    18.6mb
green    open    opensearch_dashboards_sample_data_ecommerce    wnE6r7OvSPqc5YHj8wHSLA    1    1    4675    0    8.8mb    4.4mb
green    open    security-auditlog-2024.01.31    cNRK5-2eTwes0SRlXTl0RQ    1    1    34520    0    20.5mb    9.8mb
green    open    .plugins-ml-memory-message    wTNBU4BBQVSFcFhNlUdfBQ    1    1    93    0    358.2kb    181.9kb
green    open    .plugins-flow-framework-state    dJUNDv9MSJ2jjwKbzXPlrw    1    1    39    0    114.1kb    57kb
green    open    .plugins-ml-agent    7X1IzoLuSGmIujOh9i5mmg    1    1    30    0    170.7kb    85.3kb
green    open    .plugins-flow-framework-templates    _ecC0KahTlmG_3tFUst7Uw    1    1    18    0    175.8kb    87.9kb
green    open    .plugins-ml-connector    q45iJfVjQ5KgxeNC65DLSw    1    1    11    0    313.1kb    156.5kb
green    open    .kibana_1    vRjXK4bHSUueB_4iXiQ8yw    1    1    257    0    264kb    132kb
green    open    .plugins-ml-config    G7gxGQB7TZeQzBasHd5PUg    1    1    1    0    7.8kb    3.9kb
green    open    .plugins-ml-controller    NQTZPREZRhWoDdjCglRLFg    1    1    0    0    50.1kb    49.9kb
green    open    opensearch_dashboards_sample_data_logs    9gpOTB3rRgqBLvqis_k5LQ    1    1    14074    0    18mb    9mb
green    open    .plugins-flow-framework-config    JlKPsCh6SEq-Jh6rPL_x9Q    1    1    1    0    7.8kb    3.9kb
green    open    opensearch_dashboards_sample_data_flights    pJde0irnTce4-uobHwYmMQ    1    1    13059    0    11.9mb    5.9mb
green    open    my_test_data    T4hwNs7CTJGIfw2QpCqQ_Q    1    1    6    0    91.7kb    45.8kb
green    open    .opendistro-job-scheduler-lock    XjgmXAVKQ4e8Y-ac54VBzg    1    1    3    3    36.2kb    21.3kb
"""
        }
      ]
    }
  ]
}

Register parameters

The following table lists all tool parameters that are available when registering an agent.

Parameter	Type	Required/Optional	Description
`input`	String	Required	The user input used to return index information.
`index`	String	Optional	A comma-delimited list of one or more indexes on which to run the CAT operation. Default is an empty list, which means all indexes.
`local`	Boolean	Optional	When `true`, retrieves information from the local node only instead of the cluster manager node (default is `false`).

Execute parameters

The following table lists all tool parameters that are available when running the agent.

Parameter	Type	Required/Optional	Description
`question`	String	Required	The natural language question to send to the LLM.

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