MCP Firebird

Implementation of Anthropic's MCP protocol for Firebird databases.

What is MCP Firebird and what is it for?

MCP Firebird is a server that implements Anthropic's Model Context Protocol (MCP) for Firebird SQL databases. It allows Large Language Models (LLMs) like Claude to access, analyze, and manipulate data in Firebird databases securely and in a controlled manner.

You'll find use cases and examples below.

Installation

Installing via Smithery

To install MCP Firebird for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @PuroDelphi/mcpFirebird --client claude

Manual Installation

# Global installation
npm install -g mcp-firebird

# Project installation
npm install mcp-firebird

Configuration

Environment Variables

You can configure the server using environment variables:

# Basic configuration
export FIREBIRD_HOST=localhost
export FIREBIRD_PORT=3050
export FIREBIRD_DATABASE=/path/to/database.fdb
export FIREBIRD_USER=SYSDBA
export FIREBIRD_PASSWORD=masterkey
export FIREBIRD_ROLE=undefined  # Optional

# Directory configuration (alternative)
export FIREBIRD_DATABASE_DIR=/path/to/databases  # Directory with databases

# Logging configuration
export LOG_LEVEL=info  # Options: debug, info, warn, error

You can create a .env file in the project root to set these variables. A .env.example file is provided as a template.

Example .env file

FIREBIRD_HOST=localhost
FIREBIRD_PORT=3050
FIREBIRD_DATABASE=F:\Proyectos\SAI\EMPLOYEE.FDB
FIREBIRD_USER=SYSDBA
FIREBIRD_PASSWORD=masterkey
LOG_LEVEL=info

Using with npx

You can run the server directly with npx:

npx mcp-firebird --host localhost --port 3050 --database /path/to/database.fdb --user SYSDBA --password masterkey

Using SSE (Server-Sent Events) transport

The MCP Firebird server also supports SSE transport, which allows clients to connect over HTTP:

# Set the transport type to SSE in your .env file
TRANSPORT_TYPE=sse
SSE_PORT=3003

# Run the server with SSE transport
npm run sse

You can then connect to the server using the MCP Inspector:

npx @modelcontextprotocol/inspector http://localhost:3003

Or use the provided script:

npm run inspector-sse

SSE Client Examples

We provide several example clients that demonstrate how to connect to the MCP Firebird server using SSE:

HTML/JavaScript: See examples/sse-client.html for a browser-based client
Node.js: See examples/sse-client.js for a Node.js client
Python: See examples/sse_client.py for a Python client

For detailed documentation on using the SSE transport, see docs/sse-examples.md.

Configuration with Claude Desktop

To use the Firebird MCP server with Claude Desktop:

Add the following configuration:

{
  "mcpServers": {
    "mcp-firebird": {
      "command": "npx",
      "args": [
        "mcp-firebird",
        "--host",
        "localhost",
        "--port",
        "3050",
        "--database",
        "C:\\Databases\\example.fdb",
        "--user",
        "SYSDBA",
        "--password",
        "masterkey"
      ],
      "type": "stdio"
    }
  }
}

Resources and Features

The MCP Firebird server offers:

Databases: List of all available databases
Tables: List of all tables in the database
Views: List of all views in the database
Stored procedures: Access to procedures in the database
Table schemas: Detailed structure of each table
Data: Access to table data
Performance analysis: Analyze query execution time and performance metrics
Execution plan analysis: Get and analyze SQL execution plans
Index recommendations: Identify missing indexes that could improve performance
Database backup and restore: Create and restore database backups
Database validation: Check database integrity and fix errors
Enhanced security options: Data masking, audit logging, and resource limits

Available Tools

list-tables: Lists all tables in the database
{} // No parameters required
describe-table: Describes the structure of a table
{ "tableName": "EMPLOYEES" }
execute-query: Executes an SQL query in the database
{ "sql": "SELECT * FROM EMPLOYEES WHERE DEPARTMENT_ID = 10", "params": [] // Optional parameters for prepared queries }
get-field-descriptions: Gets field descriptions
{ "tableName": "EMPLOYEES" }
analyze-query-performance: Analyzes the performance of a SQL query
{ "sql": "SELECT * FROM EMPLOYEES WHERE DEPARTMENT_ID = 10", "params": [], // Optional parameters for prepared queries "iterations": 3 // Optional number of iterations for averaging (default: 3) }
get-execution-plan: Gets the execution plan for a SQL query
{ "sql": "SELECT * FROM EMPLOYEES WHERE DEPARTMENT_ID = 10", "params": [] // Optional parameters for prepared queries }
analyze-missing-indexes: Analyzes a SQL query to identify missing indexes
{ "sql": "SELECT * FROM EMPLOYEES WHERE DEPARTMENT_ID = 10" }
backup-database: Creates a backup of the Firebird database
{ "backupPath": "C:\\backups\\mydb_backup.fbk", "options": { "format": "gbak", // "gbak" (full backup) or "nbackup" (incremental) "compress": true, // Whether to compress the backup "metadata_only": false, // Whether to backup only metadata (no data) "verbose": true // Whether to show detailed progress } }
restore-database: Restores a Firebird database from a backup
{ "backupPath": "C:\\backups\\mydb_backup.fbk", "targetPath": "C:\\databases\\restored_db.fdb", "options": { "replace": true, // Whether to replace the target database if it exists "pageSize": 4096, // Page size for the restored database "verbose": true // Whether to show detailed progress } }
validate-database: Validates the integrity of the Firebird database
{ "options": { "checkData": true, // Whether to validate data integrity "checkIndexes": true, // Whether to validate indexes "fixErrors": false, // Whether to attempt to fix errors "verbose": true // Whether to show detailed progress } }

The get-field-descriptions tool is especially useful for AI models, as it retrieves comments from Firebird's RDB$DESCRIPTION metadata, providing additional semantic context about the purpose of each field.

The performance analysis tools (analyze-query-performance, get-execution-plan, and analyze-missing-indexes) help optimize database queries by providing insights into execution time, execution plans, and index recommendations.

The database management tools (backup-database, restore-database, and validate-database) provide functionality for database maintenance and disaster recovery.

Available Prompts

query-data: Query data using natural language
Find all employees in the sales department hired in 2023
analyze-table: Analyze the structure of a table
Analyze the EMPLOYEES table and explain its structure
optimize-query: Optimize an SQL query
Optimize: SELECT * FROM EMPLOYEES WHERE LAST_NAME = 'Smith'
generate-sql: Generate SQL from a description
Generate a query to get the 10 best-selling products

Usage from Different Languages

TypeScript/JavaScript

// Example with TypeScript
import { McpClient, ChildProcessTransport } from '@modelcontextprotocol/sdk';
import { spawn } from 'child_process';

async function main() {
  // Start the MCP server process
  const serverProcess = spawn('npx', [
    'mcp-firebird',
    '--database', '/path/to/database.fdb',
    '--user', 'SYSDBA',
    '--password', 'masterkey'
  ]);

  // Create a transport and an MCP client
  const transport = new ChildProcessTransport(serverProcess);
  const client = new McpClient(transport);

  try {
    // Get server information
    const serverInfo = await client.getServerInfo();
    console.log('MCP Server:', serverInfo);

    // List available tables
    const tablesResult = await client.executeTool('list-tables', {});
    console.log('Available tables:', tablesResult);

    // Execute an SQL query
    const queryResult = await client.executeTool('execute-query', {
      sql: 'SELECT FIRST 10 * FROM EMPLOYEES'
    });
    console.log('Query results:', queryResult);

    // Use a prompt to generate SQL
    const sqlGeneration = await client.executePrompt('generate-sql', {
      description: 'Get all premium customers'
    });
    console.log('Generated SQL:', sqlGeneration);
  } catch (error) {
    console.error('Error:', error);
  } finally {
    // Close the server process
    serverProcess.kill();
  }
}

main().catch(console.error);

Python

# Example with Python
import json
import subprocess
from subprocess import PIPE

class McpFirebirdClient:
    def __init__(self, database_path, user='SYSDBA', password='masterkey'):
        # Start the MCP server process
        self.process = subprocess.Popen(
            ['npx', 'mcp-firebird', '--database', database_path, '--user', user, '--password', password],
            stdin=PIPE,
            stdout=PIPE,
            stderr=PIPE,
            text=True,
            bufsize=1
        )

    def send_request(self, method, params={}):
        request = {
            'id': 1,
            'method': method,
            'params': params
        }
        # Send the request to the server
        self.process.stdin.write(json.dumps(request) + '\n')
        self.process.stdin.flush()

        # Read the response
        response_line = self.process.stdout.readline()
        while not response_line.strip() or response_line.startswith('['):
            response_line = self.process.stdout.readline()

        # Parse and return the JSON response
        return json.loads(response_line)

    def get_server_info(self):
        return self.send_request('getServerInfo')

    def list_tables(self):
        return self.send_request('executeTool', {'name': 'list-tables', 'args': {}})

    def execute_query(self, sql, params=[]):
        return self.send_request('executeTool', {
            'name': 'execute-query',
            'args': {'sql': sql, 'params': params}
        })

    def generate_sql(self, description):
        return self.send_request('executePrompt', {
            'name': 'generate-sql',
            'args': {'description': description}
        })

    def close(self):
        self.process.terminate()

# Client usage
client = McpFirebirdClient('/path/to/database.fdb')
try:
    # Get server information
    server_info = client.get_server_info()
    print(f"MCP Server: {server_info}")

    # List tables
    tables = client.list_tables()
    print(f"Available tables: {tables}")

    # Execute a query
    results = client.execute_query("SELECT FIRST 10 * FROM EMPLOYEES")
    print(f"Results: {results}")

    # Generate SQL
    sql = client.generate_sql("List the best-selling products")
    print(f"Generated SQL: {sql}")
finally:
    client.close()

Delphi and Lazurus

// Example with Delphi
program McpFirebirdClient;

{$APPTYPE CONSOLE}

uses
  System.SysUtils, System.Classes, System.JSON, System.Net.HttpClient,
  System.Diagnostics, System.IOUtils;

type
  TMcpFirebirdClient = class
  private
    FProcess: TProcess; //For Delphi change to TProcessDelphi and add https://github.com/ferruhkoroglu/TProcessDelphi
    FRequestId: Integer;

    function SendRequest(const Method: string; const Params: TJSONObject = nil): TJSONObject;
    function ReadResponse: string;
  public
    constructor Create(const DatabasePath, User, Password: string);
    destructor Destroy; override;

    function GetServerInfo: TJSONObject;
    function ListTables: TJSONObject;
    function ExecuteQuery(const SQL: string; Params: TArray<Variant> = nil): TJSONObject;
    function GenerateSQL(const Description: string): TJSONObject;
  end;

constructor TMcpFirebirdClient.Create(const DatabasePath, User, Password: string);
begin
  inherited Create;
  FRequestId := 1;

  // Create and configure the process
  FProcess := TProcess.Create(nil);
  FProcess.Executable := 'npx';
  FProcess.Parameters.Add('mcp-firebird');
  FProcess.Parameters.Add('--database');
  FProcess.Parameters.Add(DatabasePath);
  FProcess.Parameters.Add('--user');
  FProcess.Parameters.Add(User);
  FProcess.Parameters.Add('--password');
  FProcess.Parameters.Add(Password);

  FProcess.Options := [poUsePipes, poStderrToOutPut];
  FProcess.Execute;

  // Wait for the server to start
  Sleep(2000);
end;

destructor TMcpFirebirdClient.Destroy;
begin
  FProcess.Free;
  inherited;
end;

function TMcpFirebirdClient.SendRequest(const Method: string; const Params: TJSONObject = nil): TJSONObject;
var
  Request: TJSONObject;
  RequestStr, ResponseStr: string;
begin
  // Create the JSON request
  Request := TJSONObject.Create;
  try
    Request.AddPair('id', TJSONNumber.Create(FRequestId));
    Inc(FRequestId);
    Request.AddPair('method', Method);

    if Assigned(Params) then
      Request.AddPair('params', Params)
    else
      Request.AddPair('params', TJSONObject.Create);

    RequestStr := Request.ToString + #10;

    // Send the request to the process
    FProcess.Input.Write(RequestStr[1], Length(RequestStr) * 2);

    // Read the response
    ResponseStr := ReadResponse;
    Result := TJSONObject.ParseJSONValue(ResponseStr) as TJSONObject;
  finally
    Request.Free;
  end;
end;

function TMcpFirebirdClient.ReadResponse: string;
var
  Buffer: TBytes;
  BytesRead: Integer;
  ResponseStr: string;
begin
  SetLength(Buffer, 4096);
  ResponseStr := '';

  repeat
    BytesRead := FProcess.Output.Read(Buffer[0], Length(Buffer));
    if BytesRead > 0 then
    begin
      SetLength(Buffer, BytesRead);
      ResponseStr := ResponseStr + TEncoding.UTF8.GetString(Buffer);
    end;
  until BytesRead = 0;

  Result := ResponseStr;
end;

function TMcpFirebirdClient.GetServerInfo: TJSONObject;
begin
  Result := SendRequest('getServerInfo');
end;

function TMcpFirebirdClient.ListTables: TJSONObject;
var
  Params: TJSONObject;
begin
  Params := TJSONObject.Create;
  try
    Params.AddPair('name', 'list-tables');
    Params.AddPair('args', TJSONObject.Create);
    Result := SendRequest('executeTool', Params);
  finally
    Params.Free;
  end;
end;

function TMcpFirebirdClient.ExecuteQuery(const SQL: string; Params: TArray<Variant> = nil): TJSONObject;
var
  RequestParams, Args: TJSONObject;
  ParamsArray: TJSONArray;
  I: Integer;
begin
  RequestParams := TJSONObject.Create;
  Args := TJSONObject.Create;
  ParamsArray := TJSONArray.Create;

  try
    // Configure the arguments
    Args.AddPair('sql', SQL);

    if Length(Params) > 0 then
    begin
      for I := 0 to Length(Params) - 1 do
      begin
        case VarType(Params[I]) of
          varInteger: ParamsArray.Add(TJSONNumber.Create(Integer(Params[I])));
          varDouble: ParamsArray.Add(TJSONNumber.Create(Double(Params[I])));
          varBoolean: ParamsArray.Add(TJSONBool.Create(Boolean(Params[I])));
          else ParamsArray.Add(String(Params[I]));
        end;
      end;
    end;

    Args.AddPair('params', ParamsArray);
    RequestParams.AddPair('name', 'execute-query');
    RequestParams.AddPair('args', Args);

    Result := SendRequest('executeTool', RequestParams);
  finally
    RequestParams.Free;
  end;
end;

function TMcpFirebirdClient.GenerateSQL(const Description: string): TJSONObject;
var
  RequestParams, Args: TJSONObject;
begin
  RequestParams := TJSONObject.Create;
  Args := TJSONObject.Create;

  try
    Args.AddPair('description', Description);
    RequestParams.AddPair('name', 'generate-sql');
    RequestParams.AddPair('args', Args);

    Result := SendRequest('executePrompt', RequestParams);
  finally
    RequestParams.Free;
  end;
end;

var
  Client: TMcpFirebirdClient;
  ServerInfo, Tables, QueryResults, GeneratedSQL: TJSONObject;

begin
  try
    WriteLn('Starting MCP Firebird client...');

    // Create the client
    Client := TMcpFirebirdClient.Create('C:\Databases\example.fdb', 'SYSDBA', 'masterkey');
    try
      // Get server information
      ServerInfo := Client.GetServerInfo;
      WriteLn('Server information: ', ServerInfo.ToString);

      // List tables
      Tables := Client.ListTables;
      WriteLn('Available tables: ', Tables.ToString);

      // Execute a query
      QueryResults := Client.ExecuteQuery('SELECT FIRST 10 * FROM EMPLOYEES');
      WriteLn('Query results: ', QueryResults.ToString);

      // Generate SQL
      GeneratedSQL := Client.GenerateSQL('Get all premium customers');
      WriteLn('Generated SQL: ', GeneratedSQL.ToString);
    finally
      Client.Free;
    end;
  except
    on E: Exception do
      WriteLn('Error: ', E.Message);
  end;

  WriteLn('Press ENTER to exit...');
  ReadLn;
end.

Docker Configuration

You can run the MCP Firebird server in a Docker container with support for both STDIO and SSE transports:

Dockerfile

FROM node:20-alpine

# No external Firebird client needed as MCP Firebird includes its own Node.js client

# Create application directory
WORKDIR /app

# Copy project files
COPY package*.json ./
COPY tsconfig.json ./

# Install dependencies
RUN npm install

# Copy source code
COPY src/ ./src/
COPY run-sse-server.js ./
COPY run-sse-proxy.js ./
COPY run-inspector.cjs ./
COPY run-inspector.js ./

# Compile the TypeScript project
RUN npm run build

# Expose port for SSE transport
EXPOSE 3003

# Set default environment variables
ENV FIREBIRD_HOST=firebird-db
ENV FIREBIRD_PORT=3050
ENV FIREBIRD_USER=SYSDBA
ENV FIREBIRD_PASSWORD=masterkey
ENV FIREBIRD_DATABASE=/firebird/data/database.fdb
ENV TRANSPORT_TYPE=stdio
ENV SSE_PORT=3003
ENV LOG_LEVEL=info

# Start command (can be overridden by docker-compose)
CMD ["node", "dist/index.js"]

Docker Compose

version: '3.8'

services:
  # Firebird database server
  firebird-db:
    image: jacobalberty/firebird:3.0
    environment:
      ISC_PASSWORD: masterkey
      FIREBIRD_DATABASE: database.fdb
      FIREBIRD_USER: SYSDBA
    volumes:
      - firebird-data:/firebird/data
    ports:
      - "3050:3050"
    networks:
      - mcp-network

  # MCP Firebird server with STDIO transport (for Claude Desktop)
  mcp-firebird-stdio:
    build:
      context: .
      dockerfile: Dockerfile
    environment:
      FIREBIRD_HOST: firebird-db
      FIREBIRD_PORT: 3050
      FIREBIRD_USER: SYSDBA
      FIREBIRD_PASSWORD: masterkey
      FIREBIRD_DATABASE: /firebird/data/database.fdb
      TRANSPORT_TYPE: stdio
    depends_on:
      - firebird-db
    networks:
      - mcp-network
    # For use with Claude Desktop, expose STDIO
    stdin_open: true
    tty: true

  # MCP Firebird server with SSE transport (for web clients)
  mcp-firebird-sse:
    build:
      context: .
      dockerfile: Dockerfile
    environment:
      FIREBIRD_HOST: firebird-db
      FIREBIRD_PORT: 3050
      FIREBIRD_USER: SYSDBA
      FIREBIRD_PASSWORD: masterkey
      FIREBIRD_DATABASE: /firebird/data/database.fdb
      TRANSPORT_TYPE: sse
      SSE_PORT: 3003
    ports:
      - "3003:3003"
    depends_on:
      - firebird-db
    networks:
      - mcp-network
    command: node run-sse-server.js

  # SSE Proxy (optional, for clients that need proxy support)
  mcp-sse-proxy:
    build:
      context: .
      dockerfile: Dockerfile
    environment:
      MCP_SERVER_URL: http://mcp-firebird-sse:3003
      PORT: 3005
    ports:
      - "3005:3005"
    depends_on:
      - mcp-firebird-sse
    networks:
      - mcp-network
    command: node run-sse-proxy.js

networks:
  mcp-network:
    driver: bridge

volumes:
  firebird-data:

Running with Docker

# Build and run with Docker Compose
docker compose up -d

# Run only the STDIO version (for Claude Desktop)
docker compose up -d mcp-firebird-stdio

# Run only the SSE version (for web clients)
docker compose up -d mcp-firebird-sse

# Run the SSE version with proxy (for clients that need proxy support)
docker compose up -d mcp-firebird-sse mcp-sse-proxy

# Check logs
docker compose logs -f mcp-firebird-sse

# Stop services
docker compose down

Connecting to the Dockerized MCP Server

With Claude Desktop

Update your Claude Desktop configuration to use the Docker container:

{
  "mcpServers": {
    "mcp-firebird": {
      "command": "docker",
      "args": [
        "exec",
        "-i",
        "mcp-firebird-stdio",
        "node",
        "dist/index.js"
      ],
      "type": "stdio"
    }
  }
}

With Web Clients

Connect to the SSE endpoint at http://localhost:3003 or through the proxy at http://localhost:3005.

With MCP Inspector

# Connect directly to the SSE server
npx @modelcontextprotocol/inspector http://localhost:3003

# Or connect through the proxy
npx @modelcontextprotocol/inspector http://localhost:3005

Recent Updates

Version 2.0.5

MCP Firebird has been significantly enhanced with:

SSE Transport Support: Added robust Server-Sent Events (SSE) transport implementation
Proxy Support: Added support for connecting through an SSE proxy
Multi-Transport Architecture: Support for both STDIO and SSE transports
Enhanced Security: Improved security options and configuration
Docker Support: Updated Docker configuration for all transport types

Version 1.0.93 (Previous stable version)

MCP Firebird has been significantly improved with:

Enhanced TypeScript interfaces:
- New interfaces for better type safety (FirebirdDatabase, ConfigOptions, DatabaseInfo, TableInfo, etc.)
- Stricter typing for all parameters and return values
Improved error handling:
- Custom FirebirdError class for better error categorization
- Detailed detection of different error types (connection, syntax, permissions, etc.)
- More informative error messages for easier debugging
New features and tools:
- get-methods tool for API discovery
- New prompts for analyzing tables and optimizing queries
- describeTable function for detailed table structure
- listTables function for simple table name listing
Better documentation:
- Comprehensive JSDoc for all functions
- Improved MCP tool descriptions with Firebird-specific information
- Clear specification that Firebird uses FIRST/ROWS instead of LIMIT for pagination
Security improvements:
- Explicit SQL parameter validation
- Enhanced SQL injection prevention
- Configurable access restrictions for tables and operations
Code quality:
- Removal of unnecessary files (server.js, server.new.js, test-*.js, etc.)
- More compact JSON responses (removed unnecessary spaces)
- Consistent logging approach

Use Cases

Data Analysis with AI:
- Analyze historical sales trends
- Identify patterns in financial data
- Detect anomalies in transaction records
SQL Query Generation:
- Create complex queries from natural language descriptions
- Optimize existing queries to improve performance
- Translate queries between different SQL dialects
Automated Documentation:
- Generate documentation about database structure
- Explain relationships between tables and schemas
- Create detailed data dictionaries
Development Assistance:
- Suggest indexes to improve performance
- Propose schema normalizations
- Help with data migration between systems

Example of Sales Analysis Usage

Interaction with Claude:

User: Connect to my Firebird database and analyze sales trends by region in the last quarter.

Claude: I'll connect to your Firebird database to analyze regional sales trends.

[Claude uses MCP Firebird to execute several SQL queries]

Based on data from the last quarter, I've identified the following trends:

1. The North region has experienced 12.5% growth compared to the previous quarter
2. The South region shows a 3.2% decrease in electronics products
3. The "Laptop Pro X" product is the best-selling across all regions
4. Sales in the East region show a cyclical pattern with peaks on weekends

Graphically, the distribution of sales by region is:
[Graph generated by Claude based on the data]

Would you like to delve deeper into any specific region or product category?

Example of Query Optimization and Performance Analysis

User: I have this query that's running slowly, can you optimize it?
SELECT c.CUSTOMER_NAME, SUM(o.ORDER_TOTAL)
FROM CUSTOMERS c
JOIN ORDERS o ON c.CUSTOMER_ID = o.CUSTOMER_ID
WHERE o.ORDER_DATE > '2024-01-01'
GROUP BY c.CUSTOMER_NAME
ORDER BY SUM(o.ORDER_TOTAL) DESC

Claude: I'll analyze this query to optimize it. First, let me check the execution plan and performance.

[Claude uses MCP Firebird's get-execution-plan tool]

The execution plan shows:
- Full table scan on ORDERS table
- Nested loop join with CUSTOMERS
- Sorting operation for ORDER BY clause
- No indexes being used for the date filtering

[Claude uses MCP Firebird's analyze-query-performance tool]

Performance analysis:
- Average execution time: 1250ms
- Minimum execution time: 1150ms
- Maximum execution time: 1380ms
- Rows returned: 487

[Claude uses MCP Firebird's analyze-missing-indexes tool]

Missing index analysis recommends:
- CREATE INDEX IDX_ORDERS_ORDER_DATE ON ORDERS (ORDER_DATE);
- CREATE INDEX IDX_ORDERS_CUSTOMER_ID ON ORDERS (CUSTOMER_ID);

Based on these analyses, I've identified several optimization opportunities:

1. The current query doesn't efficiently use indexes
2. The calculation of SUM(o.ORDER_TOTAL) is performed twice
3. We should add indexes on the JOIN and WHERE columns

Here's the optimized version:

```sql
SELECT c.CUSTOMER_NAME, total_sales
FROM CUSTOMERS c
JOIN (
  SELECT CUSTOMER_ID, SUM(ORDER_TOTAL) as total_sales
  FROM ORDERS
  WHERE ORDER_DATE > '2024-01-01'
  GROUP BY CUSTOMER_ID
) o ON c.CUSTOMER_ID = o.CUSTOMER_ID
ORDER BY total_sales DESC

This version:

Reduces the dataset before joining
Calculates the sum only once
Will benefit from the recommended indexes

[Claude uses MCP Firebird's analyze-query-performance tool on the new query]

After optimization:

Average execution time: 320ms (74% faster)
Rows returned: 487 (same results)

I recommend creating these indexes to further improve performance:

CREATE INDEX IDX_ORDERS_ORDER_DATE ON ORDERS (ORDER_DATE);
CREATE INDEX IDX_ORDERS_CUSTOMER_ID ON ORDERS (CUSTOMER_ID);

## Integration with AI Agents

### Claude in the Terminal

You can use the MCP Firebird server with Claude in the terminal:

```bash
# Start the MCP server in one terminal
npx mcp-firebird --database /path/to/database.fdb --user SYSDBA --password masterkey

# In another terminal, use anthropic CLI with MCP
anthropic messages create \
  --model claude-3-opus-20240229 \
  --max-tokens 4096 \
  --mcp "npx mcp-firebird --database /path/to/database.fdb --user SYSDBA --password masterkey" \
  --message "Analyze the structure of my Firebird database"

Other AI Agents

The MCP Firebird server is compatible with any agent that implements the MCP protocol, simply by providing the command to start the server:

npx mcp-firebird --database /path/to/database.fdb --user SYSDBA --password masterkey

Security

The MCP Firebird server implements comprehensive security measures:

Input validation with Zod schemas
SQL query sanitization to prevent injection attacks
Secure credential handling for database connections
SQL injection prevention through parameterized queries
Restriction of destructive operations like DROP and TRUNCATE
Data masking for sensitive information in query results
Audit logging of all database operations for security and compliance
Row-level security to filter query results based on security rules
Resource limits to prevent abuse and DoS attacks
Rate limiting to control the number of queries per session

Security Configuration

You can configure security options using a JSON configuration file. Create a file named security.json in the project root:

{
  "security": {
    "allowedTables": ["EMPLOYEES", "DEPARTMENTS"],
    "forbiddenTables": ["USERS", "PASSWORDS"],
    "allowedOperations": ["SELECT", "EXECUTE"],
    "forbiddenOperations": ["DROP", "TRUNCATE", "ALTER"],
    "maxRows": 1000,
    "queryTimeout": 5000,
    "dataMasking": [
      {
        "columns": ["CREDIT_CARD", "SSN"],
        "pattern": "\\d{4}-\\d{4}-\\d{4}-\\d{4}",
        "replacement": "XXXX-XXXX-XXXX-$&"
      }
    ],
    "rowFilters": {
      "EMPLOYEES": "DEPARTMENT_ID = 10"
    },
    "audit": {
      "enabled": true,
      "destination": "file",
      "auditFile": "./logs/audit.log",
      "detailLevel": "medium",
      "logQueries": true
    },
    "resourceLimits": {
      "maxRowsPerQuery": 5000,
      "maxResponseSize": 5242880,
      "maxQueryCpuTime": 10000,
      "maxQueriesPerSession": 100,
      "rateLimit": {
        "queriesPerMinute": 60,
        "burstLimit": 20
      }
    },
    "authorization": {
      "type": "basic",
      "rolePermissions": {
        "admin": {
          "allTablesAllowed": true,
          "operations": ["SELECT", "INSERT", "UPDATE", "DELETE"]
        },
        "user": {
          "tables": ["EMPLOYEES", "DEPARTMENTS"],
          "operations": ["SELECT"]
        }
      }
    }
  }
}

Then specify the path to the configuration file when starting the server:

export SECURITY_CONFIG_PATH=./security.json

Debugging and Troubleshooting

To enable debug mode:

export LOG_LEVEL=debug

Common Issues

Database connection error:
- Verify credentials and database path
- Make sure the Firebird server is running
- Check that the user has sufficient permissions
Server doesn't appear in Claude Desktop:
- Restart Claude Desktop
- Verify the configuration in claude_desktop_config.json
- Make sure the database path is absolute
STDIO issues:
- Ensure standard output is not being redirected
- Don't use console.log for debugging (use console.error instead)

License

MIT

Integrations