last9/last9-mcp-server

Last9 MCP Server

A Model Context Protocol server implementation for Last9 that enables AI agents to seamlessly bring real-time production context — logs, metrics, and traces — into your local environment to auto-fix code faster.

• View demo
• Read our announcement blog post

Status

Works with Claude desktop app, or Cursor, Windsurf, and VSCode (Github Copilot) IDEs. Implements the following MCP tools:

Observability & APM Tools:

• get_exceptions: Get the list of exceptions.
• get_service_summary: Get service summary with throughput, error rate, and response time.
• get_service_environments: Get available environments for services.
• get_service_performance_details: Get detailed performance metrics for a service.
• get_service_operations_summary: Get operations summary for a service.
• get_service_dependency_graph: Get service dependency graph showing incoming/outgoing dependencies.

Prometheus/PromQL Tools:

• prometheus_range_query: Execute PromQL range queries for metrics data.
• prometheus_instant_query: Execute PromQL instant queries for metrics data.
• prometheus_label_values: Get label values for PromQL queries.
• prometheus_labels: Get available labels for PromQL queries.

Logs Management:

• get_logs: Get logs filtered by service name and/or severity level.
• get_drop_rules: Get drop rules for logs that determine what logs get filtered out at Last9 Control Plane
• add_drop_rule: Create a drop rule for logs at Last9 Control Plane
• get_service_logs: Get raw log entries for a specific service over a time range. Can apply filters on severity and body.
• get_log_attributes: Get available log attributes (labels) for a specified time window.

Traces Management:

• get_service_traces: Query traces for a specific service with filtering options for span kinds, status codes, and other trace attributes.
• get_trace_attributes: Get available trace attributes (series) for a specified time window.

Change Events:

• get_change_events: Get change events from the last9_change_events prometheus metric over a given time range.

Alert Management:

• get_alert_config: Get alert configurations (alert rules) from Last9.
• get_alerts: Get currently active alerts from Last9 monitoring system.

Tools Documentation

get_exceptions

Retrieves server-side exceptions over a specified time range.

Parameters:

• limit (integer, optional): Maximum number of exceptions to return. Default: 20.
• lookback_minutes (integer, recommended): Number of minutes to look back from now. Default: 60. Examples: 60, 30, 15.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to use lookback_minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.
• span_name (string, optional): Name of the span to filter by.

get_service_summary

Get service summary over a given time range. Includes service name, environment, throughput, error rate, and response time. All values are p95 quantiles over the time range.

Parameters:

• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to end_time_iso - 1 hour.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.
• env (string, optional): Environment to filter by. Defaults to 'prod'.

get_service_environments

Get available environments for services. Returns an array of environments that can be used with other APM tools.

Parameters:

• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to end_time_iso - 1 hour.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.

Note: All other APM tools that retrieve service information (like get_service_performance_details, get_service_dependency_graph, get_service_operations_summary, get_service_summary) require an env parameter. This parameter must be one of the environments returned by this tool. If this tool returns an empty array, use an empty string "" for the env parameter.

get_service_performance_details

Get detailed performance metrics for a specific service over a given time range.

Parameters:

• service_name (string, required): Name of the service to get performance details for.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to now - 60 minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.
• env (string, optional): Environment to filter by. Defaults to 'prod'.

get_service_operations_summary

Get a summary of operations inside a service over a given time range. Returns operations like HTTP endpoints, database queries, messaging producer and HTTP client calls.

Parameters:

• service_name (string, required): Name of the service to get operations summary for.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to now - 60 minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.
• env (string, optional): Environment to filter by. Defaults to 'prod'.

get_service_dependency_graph

Get details of the throughput, response times and error rates of incoming, outgoing and infrastructure components of a service. Useful for analyzing cascading effects of errors and performance issues.

Parameters:

• service_name (string, optional): Name of the service to get the dependency graph for.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to now - 60 minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.
• env (string, optional): Environment to filter by. Defaults to 'prod'.

prometheus_range_query

Perform a Prometheus range query to get metrics data over a specified time range. Recommended to check available labels first using prometheus_labels tool.

Parameters:

• query (string, required): The range query to execute.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to now - 60 minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.

prometheus_instant_query

Perform a Prometheus instant query to get metrics data at a specific point in time. Typically should use rollup functions like sum_over_time, avg_over_time, quantile_over_time over a time window.

Parameters:

• query (string, required): The instant query to execute.
• time_iso (string, optional): Time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.

prometheus_label_values

Return the label values for a particular label and PromQL filter query. Similar to Prometheus /label_values call.

Parameters:

• match_query (string, required): A valid PromQL filter query.
• label (string, required): The label to get values for.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to now - 60 minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.

prometheus_labels

Return the labels for a given PromQL match query. Similar to Prometheus /labels call.

Parameters:

• match_query (string, required): A valid PromQL filter query.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to now - 60 minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.

get_logs

Gets logs filtered by service name and/or severity level within a specified time range. This tool now uses the advanced v2 logs API with physical index optimization for better performance.

Note: This tool now requires a service_name parameter and internally uses the same advanced infrastructure as get_service_logs.

Parameters:

• service_name (string, required): Name of the service to get logs for.
• severity (string, optional): Severity of the logs to get (automatically converted to severity_filters format).
• lookback_minutes (integer, recommended): Number of minutes to look back from now. Default: 60. Examples: 60, 30, 15.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to use lookback_minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.
• limit (integer, optional): Maximum number of logs to return. Default: 20.
• env (string, optional): Environment to filter by. Use "get_service_environments" tool to get available environments.

get_drop_rules

Gets drop rules for logs, which determine what logs get filtered out from reaching Last9.

add_drop_rule

Adds a new drop rule to filter out specific logs at Last9 Control Plane

Parameters:

• name (string, required): Name of the drop rule.
• filters (array, required): List of filter conditions to apply. Each filter has:
  • key (string, required): The key to filter on. Only attributes and resource.attributes keys are supported. For resource attributes, use format: resource.attributes[key_name] and for log attributes, use format: attributes[key_name] Double quotes in key names must be escaped.
  • value (string, required): The value to filter against.
  • operator (string, required): The operator used for filtering. Valid values:
    • "equals"
    • "not_equals"
  • conjunction (string, required): The logical conjunction between filters. Valid values:
    • "and"

get_alert_config

Get alert configurations (alert rules) from Last9. Returns all configured alert rules including their conditions, labels, and annotations.

Parameters:

None - This tool retrieves all available alert configurations.

Returns information about:

• Alert rule ID and name
• Primary indicator being monitored
• Current state and severity
• Algorithm used for alerting
• Entity ID and organization details
• Properties and configuration
• Creation and update timestamps
• Group timeseries notification settings

get_alerts

Get currently active alerts from Last9 monitoring system. Returns all alerts that are currently firing or have fired recently within the specified time window.

Parameters:

• timestamp (integer, optional): Unix timestamp for the query time. Leave empty to default to current time.
• window (integer, optional): Time window in seconds to look back for alerts. Defaults to 900 seconds (15 minutes). Range: 60-86400 seconds.

Returns information about:

• Alert rule details (ID, name, group, type)
• Current state and severity
• Last fired timestamp and duration
• Rule properties and configuration
• Alert instances with current values
• Metric degradation information
• Group labels and annotations for each instance

get_service_logs

Get raw log entries for a specific service over a time range. This tool retrieves actual log entries including log messages, timestamps, severity levels, and other metadata. Useful for debugging issues, monitoring service behavior, and analyzing specific log patterns.

Parameters:

• service_name (string, required): Name of the service to get logs for.
• lookback_minutes (integer, optional): Number of minutes to look back from now. Default: 60 minutes. Examples: 60, 30, 15.
• limit (integer, optional): Maximum number of log entries to return. Default: 20.
• env (string, optional): Environment to filter by. Use "get_service_environments" tool to get available environments.
• severity_filters (array, optional): Array of severity patterns to filter logs (e.g., ["error", "warn"]). Uses OR logic.
• body_filters (array, optional): Array of message content patterns to filter logs (e.g., ["timeout", "failed"]). Uses OR logic.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to now - lookback_minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.

Filtering behavior:

• Multiple filter types are combined with AND logic (service AND severity AND body)
• Each filter array uses OR logic (matches any pattern in the array)

Examples:

• service_name="api" + severity_filters=["error"] + body_filters=["timeout"] → finds error logs containing "timeout"
• service_name="web" + body_filters=["timeout", "failed", "error 500"] → finds logs containing any of these patterns

get_log_attributes

Get available log attributes (labels) for a specified time window. This tool retrieves all attribute names that exist in logs during the specified time range, which can be used for filtering and querying logs.

Parameters:

• lookback_minutes (integer, optional): Number of minutes to look back from now for the time window. Default: 15. Examples: 15, 30, 60.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to use lookback_minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.
• region (string, optional): AWS region to query. Leave empty to use default from configuration. Examples: ap-south-1, us-east-1, eu-west-1.

Returns:

• List of log attributes grouped into two categories:
  • Log Attributes: Standard log fields like service, severity, body, level, etc.
  • Resource Attributes: Resource-related fields prefixed with "resource_" like resource_k8s.pod.name, resource_service.name, etc.

get_service_traces

Query traces for a specific service with filtering options for span kinds, status codes, and other trace attributes. This tool retrieves distributed tracing data for debugging performance issues, understanding request flows, and analyzing service interactions.

Parameters:

• service_name (string, required): Name of the service to get traces for.
• lookback_minutes (integer, optional): Number of minutes to look back from now. Default: 60 minutes. Examples: 60, 30, 15.
• limit (integer, optional): Maximum number of traces to return. Default: 10.
• env (string, optional): Environment to filter by. Use "get_service_environments" tool to get available environments.
• span_kind (array, optional): Filter by span types (server, client, internal, consumer, producer).
• span_name (string, optional): Filter by specific span name.
• status_code (array, optional): Filter by trace status (ok, error, unset, success).
• order (string, optional): Field to order traces by. Default: "Duration". Options: Duration, Timestamp.
• direction (string, optional): Sort direction. Default: "backward". Options: forward, backward.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to now - lookback_minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.

Filtering options:

• Combine multiple filters to narrow down specific traces of interest
• Use time range filters with lookback_minutes or explicit start/end times

Examples:

• service_name="api" + span_kind=["server"] + status_code=["error"] → finds failed server-side traces
• service_name="payment" + span_name="process_payment" + lookback_minutes=30 → finds payment processing traces from last 30 minutes

get_trace_attributes

Get available trace attributes (series) for a specified time window. This tool retrieves all attribute names that exist in traces during the specified time range, which can be used for filtering and querying traces.

Parameters:

• lookback_minutes (integer, optional): Number of minutes to look back from now for the time window. Default: 15. Examples: 15, 30, 60.
• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to use lookback_minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.
• region (string, optional): AWS region to query. Leave empty to use default from configuration. Examples: ap-south-1, us-east-1, eu-west-1.

Returns:

• An alphabetically sorted list of all available trace attributes (e.g., http.method, http.status_code, db.name, resource_service.name, duration, etc.)

get_change_events

Get change events from the last9_change_events prometheus metric over a given time range. Returns change events that occurred in the specified time window, including deployments, configuration changes, and other system modifications.

Parameters:

• start_time_iso (string, optional): Start time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to now - lookback_minutes.
• end_time_iso (string, optional): End time in ISO format (YYYY-MM-DD HH:MM:SS). Leave empty to default to current time.
• lookback_minutes (integer, optional): Number of minutes to look back from now. Default: 60 minutes. Examples: 60, 30, 15.
• service (string, optional): Name of the service to filter change events for.
• environment (string, optional): Environment to filter by.
• event_name (string, optional): Name of the change event to filter by (use available_event_names to see valid values).

Returns:

• available_event_names: List of all available event types that can be used for filtering
• change_events: Array of timeseries data with metric labels and timestamp-value pairs
• count: Total number of change events returned
• time_range: Start and end time of the query window

Each change event includes:

• metric: Map of metric labels (service_name, env, event_type, message, etc.)
• values: Array of timestamp-value pairs representing the timeseries data

Common event types include: deployment, config_change, rollback, scale_up/scale_down, restart, upgrade/downgrade, maintenance, backup/restore, health_check, certificate, database.

Best practices:

1. First call without event_name to get available_event_names
2. Use exact event name from available_event_names for the event_name parameter
3. Combine with other filters (service, environment, time) for precise results

Installation

You can install and run the Last9 Observability MCP server in several ways:

Local Installation

For local development and traditional STDIO usage:

Homebrew

# Add the Last9 tap
brew tap last9/tap

# Install the Last9 MCP CLI
brew install last9-mcp

NPM

# Install globally
npm install -g @last9/mcp-server

# Or run directly with npx
npx @last9/mcp-server

Configuration

Environment Variables

The Last9 MCP server requires the following environment variables:

• LAST9_BASE_URL: (required) Last9 API URL from OTel integration
• LAST9_AUTH_TOKEN: (required) Authentication token for Last9 MCP server from OTel integration
• LAST9_REFRESH_TOKEN: (required) Refresh Token with Write permissions, needed for accessing control plane APIs from API Access

Usage

Usage with Claude Desktop

Configure the Claude app to use the MCP server:

1. Open the Claude Desktop app, go to Settings, then Developer
2. Click Edit Config
3. Open the claude_desktop_config.json file
4. Copy and paste the server config to your existing file, then save
5. Restart Claude

If installed via Homebrew:

{
  "mcpServers": {
    "last9": {
      "command": "/opt/homebrew/bin/last9-mcp",
      "env": {
        "LAST9_BASE_URL": "<last9_otlp_host>",
        "LAST9_AUTH_TOKEN": "<last9_otlp_auth_token>",
        "LAST9_REFRESH_TOKEN": "<last9_write_refresh_token>"
      }
    }
  }
}

If installed via NPM:

{
  "mcpServers": {
    "last9": {
      "command": "npx",
      "args": ["-y", "@last9/mcp-server"],
      "env": {
        "LAST9_BASE_URL": "<last9_otlp_host>",
        "LAST9_AUTH_TOKEN": "<last9_otlp_auth_token>",
        "LAST9_REFRESH_TOKEN": "<last9_write_refresh_token>"
      }
    }
  }
}

Usage with Cursor

Configure Cursor to use the MCP server:

1. Open Cursor, go to Settings, then Cursor Settings
2. Select MCP on the left
3. Click Add "New Global MCP Server" at the top right
4. Copy and paste the server config to your existing file, then save
5. Restart Cursor

If installed via Homebrew:

{
  "mcpServers": {
    "last9": {
      "command": "/opt/homebrew/bin/last9-mcp",
      "env": {
        "LAST9_BASE_URL": "<last9_otlp_host>",
        "LAST9_AUTH_TOKEN": "<last9_otlp_auth_token>",
        "LAST9_REFRESH_TOKEN": "<last9_write_refresh_token>"
      }
    }
  }
}

If installed via NPM:

{
  "mcpServers": {
    "last9": {
      "command": "npx",
      "args": ["-y", "@last9/mcp-server"],
      "env": {
        "LAST9_BASE_URL": "<last9_otlp_host>",
        "LAST9_AUTH_TOKEN": "<last9_otlp_auth_token>",
        "LAST9_REFRESH_TOKEN": "<last9_write_refresh_token>"
      }
    }
  }
}

Usage with Windsurf

Configure Windsurf to use the MCP server:

1. Open Windsurf, go to Settings, then Developer
2. Click Edit Config
3. Open the windsurf_config.json file
4. Copy and paste the server config to your existing file, then save
5. Restart Windsurf

If installed via Homebrew:

{
  "mcpServers": {
    "last9": {
      "command": "/opt/homebrew/bin/last9-mcp",
      "env": {
        "LAST9_BASE_URL": "<last9_otlp_host>",
        "LAST9_AUTH_TOKEN": "<last9_otlp_auth_token>",
        "LAST9_REFRESH_TOKEN": "<last9_write_refresh_token>"
      }
    }
  }
}

If installed via NPM:

{
  "mcpServers": {
    "last9": {
      "command": "npx",
      "args": ["-y", "@last9/mcp-server"],
      "env": {
        "LAST9_BASE_URL": "<last9_otlp_host>",
        "LAST9_AUTH_TOKEN": "<last9_otlp_auth_token>",
        "LAST9_REFRESH_TOKEN": "<last9_write_refresh_token>"
      }
    }
  }
}

Usage with VS Code

Note: MCP support in VS Code is available starting v1.99 and is currently in preview. For advanced configuration options and alternative setup methods, view the VS Code MCP documentation.

1. Open VS Code, go to Settings, select the User tab, then Features, then Chat
2. Click "Edit settings.json"
3. Copy and paste the server config to your existing file, then save
4. Restart VS Code

If installed via Homebrew:

{
  "mcp": {
    "servers": {
      "last9": {
        "type": "stdio",
        "command": "/opt/homebrew/bin/last9-mcp",
        "env": {
          "LAST9_BASE_URL": "<last9_otlp_host>",
          "LAST9_AUTH_TOKEN": "<last9_otlp_auth_token>",
          "LAST9_REFRESH_TOKEN": "<last9_write_refresh_token>"
        }
      }
    }
  }
}

If installed via NPM:

{
  "mcp": {
    "servers": {
      "last9": {
        "type": "stdio",
        "command": "npx",
        "args": ["-y", "@last9/mcp-server"],
        "env": {
          "LAST9_BASE_URL": "<last9_otlp_host>",
          "LAST9_AUTH_TOKEN": "<last9_otlp_auth_token>",
          "LAST9_REFRESH_TOKEN": "<last9_write_refresh_token>"
        }
      }
    }
  }
}

Development

For local development and testing, you can run the MCP server in HTTP mode which makes it easier to debug requests and responses.

Running in HTTP Mode

Set the HTTP_MODE environment variable to enable HTTP server mode:

# Export required environment variables
export LAST9_API_TOKEN="your_api_token"
export LAST9_BASE_URL="https://your-last9-endpoint"  # Your Last9 endpoint
export HTTP_MODE=true
export HTTP_PORT=8080  # Optional, defaults to 8080

# Run the server
./last9-mcp-server

The server will start on http://localhost:8080/mcp and you can test it with curl:

Testing with curl

# Test get_service_logs
curl -X POST http://localhost:8080/mcp \
    -H "Content-Type: application/json" \
    -H "Mcp-Session-Id: session_$(date +%s)000000000" \
    -d '{
      "jsonrpc": "2.0",
      "id": 1,
      "method": "tools/call",
      "params": {
        "name": "get_service_logs",
        "arguments": {
          "service_name": "your-service-name",
          "lookback_minutes": 30,
          "limit": 10
        }
      }
    }'

# Test get_service_traces
curl -X POST http://localhost:8080/mcp \
    -H "Content-Type: application/json" \
    -H "Mcp-Session-Id: session_$(date +%s)000000000" \
    -d '{
      "jsonrpc": "2.0",
      "id": 2,
      "method": "tools/call",
      "params": {
        "name": "get_service_traces",
        "arguments": {
          "service_name": "your-service-name",
          "lookback_minutes": 60,
          "limit": 5
        }
      }
    }'

# List available tools
curl -X POST http://localhost:8080/mcp \
    -H "Content-Type: application/json" \
    -H "Mcp-Session-Id: session_$(date +%s)000000000" \
    -d '{
      "jsonrpc": "2.0",
      "id": 3,
      "method": "tools/list",
      "params": {}
    }'

Building from Source

# Clone the repository
git clone https://github.com/last9/last9-mcp-server.git
cd last9-mcp-server

# Build the binary
go build -o last9-mcp-server

# Run in development mode
HTTP_MODE=true ./last9-mcp-server

Note: HTTP mode is for development and testing only. When integrating with Claude Desktop or other MCP clients, use the default STDIO mode (without HTTP_MODE=true).

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