Zsvirt

ZSvirt MCP Server

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An MCP server that enables AI assistants to dynamically discover and invoke more than 2,000 ZSvirt APIs.

Features

• API search: Search ZStack APIs by keyword with fuzzy matching
• API description: Retrieve detailed parameter documentation for an API
• API execution: Invoke a ZStack API and return its result
• Metric search: Search available monitoring metrics
• Metric data retrieval: Retrieve monitoring data for a specified metric

Installation

# Install from PyPI
pip install zsvirt-mcp-server

# Or install with uv
uv pip install zsvirt-mcp-server

💡 You can also run the server directly with uvx or pipx run without installing it. See Usage.

Configuration

Set the following environment variables:

export ZSTACK_API_URL="http://localhost:8080"  # ZStack API endpoint
export ZSTACK_ALLOW_ALL_API="false"             # Allow write operations (optional; default: false)

# Authentication method 1: account and password (automatically logs in and obtains a session)
export ZSTACK_ACCOUNT="admin"                   # Account name
export ZSTACK_PASSWORD="your-password"          # Plain-text password

# Authentication method 2: use an existing session ID
# This method takes precedence over account/password authentication.
export ZSTACK_SESSION_ID="your-session-uuid"    # Existing session UUID

# Query response controls (optional)
export ZSTACK_QUERY_DEFAULT_LIMIT="50"          # Default Query API limit; set to 0 to disable
export ZSTACK_RESPONSE_SIZE_LIMIT="65536"       # Maximum response size in bytes; set to 0 to disable

Authentication methods

Method	Environment variables	Description
Account and password	ZSTACK_ACCOUNT + ZSTACK_PASSWORD	Automatically logs in and obtains a session
Session ID	ZSTACK_SESSION_ID	Uses an existing session and takes precedence over account/password authentication

💡 If both ZSTACK_SESSION_ID and account/password credentials are configured, the session ID takes precedence.

Security

By default, only read-only APIs are allowed, including:

• Query* — query operations
• Get* — get operations
• List* — list operations
• Describe* — describe operations
• Check* — check operations
• Count* — count operations
• Other read-only operations

To enable write APIs such as CreateVmInstance and DeleteVolume, set:

export ZSTACK_ALLOW_ALL_API="true"

⚠️ Warning: When write operations are enabled, an AI assistant can create, delete, and modify resources. Enable this option with care.

Query response controls

The server injects limit=50 into Query APIs by default to prevent a single request from filling the model context window. If a response exceeds 64 KiB, the server truncates the inventories list while preserving valid JSON.

Environment variable	Default	Description
ZSTACK_QUERY_DEFAULT_LIMIT	50	Default limit injected when a Query API does not specify one; set to 0 to disable
ZSTACK_RESPONSE_SIZE_LIMIT	65536	Maximum response size in bytes; oversized responses are truncated; set to 0 to disable

• An explicitly supplied limit is never overwritten.
• A truncated response includes a _truncation field suggesting pagination with limit/start or response reduction with fields.

Usage

Run as an MCP server

# Run directly with uvx (no installation required)
uvx zsvirt-mcp-server

# Or use pipx
pipx run zsvirt-mcp-server

# Run the installed command
zsvirt-mcp-server

SSE transport

The default transport is stdio. Use command-line options or environment variables to enable SSE:

# Command-line options
uvx zsvirt-mcp-server --transport sse --host 0.0.0.0 --port 8000

# Environment variables
export MCP_TRANSPORT="sse"
export MCP_HOST="0.0.0.0"
export MCP_PORT="8000"
export MCP_PATH="/sse"  # Optional
uvx zsvirt-mcp-server

The server also supports the native FastMCP variables FASTMCP_HOST, FASTMCP_PORT, and FASTMCP_MOUNT_PATH.

Streamable HTTP transport

# Command-line options
uvx zsvirt-mcp-server --transport streamable-http --host 0.0.0.0 --port 8000 --streamable-path /mcp

# Environment variables
export MCP_TRANSPORT="streamable-http"
export MCP_HOST="0.0.0.0"
export MCP_PORT="8000"
export MCP_STREAMABLE_PATH="/mcp"  # Optional
uvx zsvirt-mcp-server

The server also supports FASTMCP_STREAMABLE_HTTP_PATH.

HTTP header authentication (multi-tenant mode)

In SSE or Streamable HTTP mode, an administrator can run a shared MCP server while each user supplies their own credentials through HTTP headers.

HTTP header	Environment variable	Description
X-ZStack-Account	ZSTACK_ACCOUNT	Account name
X-ZStack-Password	ZSTACK_PASSWORD	Password
X-ZStack-Session-Id	ZSTACK_SESSION_ID	Existing session; takes precedence over account/password authentication
X-ZStack-API-URL	ZSTACK_API_URL	ZStack management node endpoint; allows proxying multiple environments

Credential precedence: HTTP headers > environment variables.

# Start a shared MCP server
ZSTACK_ALLOW_ALL_API=false uvx zsvirt-mcp-server --transport streamable-http --host 0.0.0.0 --port 8000

Users can configure credentials as HTTP headers in an MCP client:

{
  "mcpServers": {
    "zstack": {
      "transport": "streamable-http",
      "url": "http://mcp-server:8000/mcp",
      "headers": {
        "X-ZStack-Account": "user-a",
        "X-ZStack-Password": "password-a",
        "X-ZStack-API-URL": "http://zstack-env-1:8080"
      }
    }
  }
}

• Sessions are cached and reused for the same account.
• Requests with different X-ZStack-API-URL values are routed to different ZStack environments.
• stdio mode has no HTTP headers and automatically falls back to environment-variable authentication.

Claude Desktop configuration

Add the server to claude_desktop_config.json.

Method 1: account and password

{
  "mcpServers": {
    "zstack": {
      "command": "uvx",
      "args": ["zsvirt-mcp-server"],
      "env": {
        "ZSTACK_API_URL": "http://your-zstack-server:8080",
        "ZSTACK_ACCOUNT": "admin",
        "ZSTACK_PASSWORD": "your-password",
        "ZSTACK_ALLOW_ALL_API": "false"
      }
    }
  }
}

Method 2: session ID

{
  "mcpServers": {
    "zstack": {
      "command": "uvx",
      "args": ["zsvirt-mcp-server"],
      "env": {
        "ZSTACK_API_URL": "http://your-zstack-server:8080",
        "ZSTACK_SESSION_ID": "your-session-uuid",
        "ZSTACK_ALLOW_ALL_API": "false"
      }
    }
  }
}

💡 Set ZSTACK_ALLOW_ALL_API to "true" to enable create, delete, and modify operations.

Available tools

1. search_api

Search ZStack APIs by keyword.

Parameters:

• keywords (list[str]): Search keywords, for example ["Query", "Vm"]
• category (str, optional): Filter by category
• limit (int, default: 15): Maximum number of results

2. describe_api

Retrieve detailed parameter documentation for an API.

Parameters:

• api_name (str): API name, for example QueryVmInstance

3. execute_api

Invoke a ZStack API.

Parameters:

• api_name (str): API name
• parameters (dict): API parameters

4. search_metric

Search available monitoring metrics.

Parameters:

• keywords (list[str]): Search keywords
• namespace (str, optional): Fuzzy namespace filter, such as vm or host
• limit (int, default: 20): Maximum number of results
• match_mode (str, default: or): Keyword matching mode: and or or
• prefer_namespaces (list[str], optional): Namespaces to rank first; defaults to ["ZStack/VM", "ZStack/Host"]

💡 If the namespace is unknown, omit it first. Search results include namespace values that can be used in a subsequent request.

The default match_mode is or. Pass and explicitly to require all keywords.

Metric names can overlap across namespaces. Specify namespace or prefer_namespaces to control result ranking.

5. get_metric_data

Retrieve monitoring data.

Parameters:

• namespace (str): Namespace
• metric_name (str): Metric name
• start_time (str | int, optional): Start time as ISO text or a Unix timestamp in seconds
• end_time (str | int, optional): End time as ISO text or a Unix timestamp in seconds
• period (int, default: 60): Sampling period in seconds
• labels (list[str] | dict, optional): Label filters such as ["VMUuid=xxx"] or {"VMUuid": "xxx"}
• summary_only (bool, optional): Return only statistics: count, maximum, minimum, average, variance, and standard deviation

Response size guidance:

estimated_points = ceil((end_time - start_time) / period) * series_count

series_count is the number of unique label combinations. Omitting labels can return multiple series. Reduce output size by shortening the time range, increasing period, or adding label filters.

6. get_metric_summary

Retrieve aggregated Top-N metric results grouped by a label key.

Parameters:

• namespace (str): Namespace
• metric_name (str): Metric name
• label_key (str): Grouping label, such as VMUuid or HostUuid
• metric_names (list[str], optional): Metrics to combine, such as inbound and outbound metrics
• start_time (str | int, optional): Start time as ISO text or a Unix timestamp in seconds
• end_time (str | int, optional): End time as ISO text or a Unix timestamp in seconds
• period (int, default: 60): Sampling period in seconds
• aggregate (str, default: max): Per-metric aggregation: max, avg, sum, or min
• combine (str, default: sum): Multi-metric combination: sum, avg, max, or min
• threshold_op (str, optional): Comparison operator: >, >=, <, <=, ==, or !=
• threshold_value (number, optional): Threshold value
• top_n (int, default: 10): Number of results
• resolve_resource (str, optional): vm or host, used to resolve resource names

Query API condition syntax

For Query APIs, the conditions parameter supports these operators:

Operator	Meaning	Example
=	Equal	name=test
!=	Not equal	state!=Deleted
>	Greater than	cpuNum>4
>=	Greater than or equal	memorySize>=1073741824
<	Less than	createDate<2024-01-01
<=	Less than or equal
?=	Fuzzy match (LIKE; some versions use like)	name?=%test%
!?=	Fuzzy non-match
~=	Regular-expression match	name~=.*test.*
!~=	Regular-expression non-match
=null	Is null	description=null
!=null	Is not null
in	In list	state?=Running,Stopped
not in	Not in list	state!?=Deleted,Destroyed

conditions format:

{
  "conditions": [
    {"name": "uuid", "op": "=", "value": "xxx"},
    {"name": "state", "op": "in", "value": "Running,Stopped"}
  ]
}

Example interaction

User: "Show me the details of the VM whose UUID starts with ae6e57a0."

The AI assistant will:

1. Call search_api(keywords=["Query", "Vm", "Instance"])
2. Call describe_api(api_name="QueryVmInstance")
3. Call execute_api(api_name="QueryVmInstance", parameters={"conditions": [{"name": "uuid", "op": "?=", "value": "ae6e57a0%"}]})

Development

# Clone the repository
git clone https://github.com/ZSvirt/zsvirt-mcp-server.git
cd zsvirt-mcp-server

# Install development dependencies
pip install -e ".[dev]"

# Run tests
pytest

License

MIT