# MCP tool reference

1 callable tools.

Use tools/call at https://mcp.schedulerzero.com/mcp with the exact tool name and arguments below. The /tools/ paths in this view are documentation identifiers, not HTTP endpoints. Request execution is disabled for this reference.

Inputs are shown for personal API keys (bound) and for OAuth/delegated agents. Output schemas describe MCP structuredContent: native objects pass through; arrays, scalars and null use a data wrapper. Text content retains the native JSON result.

[Connect a client](/mcp/connect) · [Authentication and authorization](/authentication) · [Generated auth guide](/auth.md) · [Download tool catalog](/mcp-catalog.json) · [Agent documentation](/llms.txt)

## list_task_assignable_members

List members eligible to hold a task assignment.

Use before assign_task, or while configuring a workflow human-input node, to pick real responders.

Do not treat the list as permission evidence; it is a directory.

Scopes: task:read

Risk: read; confirmation: none; idempotency: none.

### Input schema (personal API key)

```json
{
  "type": "object",
  "properties": {
    "workspaceId": {
      "type": "string",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
      "format": "uuid"
    }
  },
  "required": [
    "workspaceId"
  ],
  "patternProperties": {
    "^(?!(?:workspaceId)$)[\\s\\S]*$": false
  },
  "additionalProperties": true,
  "propertyNames": {
    "anyOf": [
      {
        "type": "string",
        "enum": [
          "workspaceId"
        ]
      }
    ]
  }
}
```

### Input schema (OAuth / delegated agent)

```json
{
  "type": "object",
  "properties": {
    "workspaceId": {
      "type": "string",
      "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
      "format": "uuid"
    }
  },
  "required": [
    "workspaceId"
  ],
  "patternProperties": {
    "^(?!(?:workspaceId)$)[\\s\\S]*$": false
  },
  "additionalProperties": true,
  "propertyNames": {
    "anyOf": [
      {
        "type": "string",
        "enum": [
          "workspaceId"
        ]
      }
    ]
  }
}
```

### Output schema (structuredContent)

```json
{
  "type": "object",
  "properties": {
    "members": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "userId": {
            "type": "string",
            "pattern": "^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|[fF]{8}-[fF]{4}-[fF]{4}-[fF]{4}-[fF]{12})$",
            "format": "uuid"
          },
          "name": {
            "$ref": "#/$defs/ShortText"
          },
          "email": {
            "$ref": "#/$defs/EmailAddress"
          },
          "image": {
            "anyOf": [
              {
                "type": "string"
              },
              {
                "type": "null"
              }
            ]
          },
          "role": {
            "$ref": "#/$defs/NonEmptyString"
          }
        },
        "required": [
          "userId",
          "name",
          "email",
          "image",
          "role"
        ],
        "patternProperties": {
          "^(?!(?:userId|name|email|image|role)$)[\\s\\S]*$": false
        },
        "additionalProperties": true,
        "propertyNames": {
          "type": "string",
          "enum": [
            "userId",
            "name",
            "email",
            "image",
            "role"
          ]
        }
      }
    }
  },
  "required": [
    "members"
  ],
  "patternProperties": {
    "^(?!(?:members)$)[\\s\\S]*$": false
  },
  "additionalProperties": true,
  "propertyNames": {
    "anyOf": [
      {
        "type": "string",
        "enum": [
          "members"
        ]
      }
    ]
  },
  "$defs": {
    "ShortText": {
      "type": "string",
      "minLength": 1,
      "maxLength": 256
    },
    "EmailAddress": {
      "type": "string",
      "minLength": 3,
      "maxLength": 320,
      "pattern": "^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$"
    },
    "NonEmptyString": {
      "type": "string",
      "minLength": 1,
      "maxLength": 4096
    }
  }
}
```

### Underlying API operations

- `tasks.assignableMembers`: `GET /v1/workspaces/:workspaceId/tasks/assignable-members`