Read Only Query Mode With Write Protection

via “read-only sql query execution with safety defaults”

Query and explore PostgreSQL databases through MCP tools.

Unique: Implements read-only enforcement at the MCP server layer (not relying on database role restrictions), with explicit query validation before execution. This ensures safety even if the PostgreSQL user account has broader permissions.

vs others: Safer than direct database connections or REST APIs that expose write operations; more flexible than database-level read-only roles because it can be toggled per MCP server instance without modifying PostgreSQL permissions.

via “read-only-mode-for-production-deployments”

An official Qdrant Model Context Protocol (MCP) server implementation

Unique: Implements read-only mode by conditionally registering MCP tools at startup, completely removing write capabilities rather than adding runtime checks. This is a deployment-level safety mechanism rather than a per-operation guard.

vs others: Simpler and more reliable than runtime permission checks because it prevents write tools from being registered at all; more appropriate for production than relying on client-side enforcement.

via “read-only query mode with write protection”

Enhanced PostgreSQL MCP server with read and write capabilities. Based on @modelcontextprotocol/server-postgres by Anthropic.

Unique: Implements write protection at the MCP server layer (not database-level permissions), allowing the same database user to have different access levels depending on the MCP configuration. Provides a simple on/off toggle for read-only mode.

vs others: Simpler than managing database-level roles and permissions for each LLM user, but less secure than true database-level access control.

via “read-write capability gating with permission control”

Enhanced PostgreSQL MCP server with read and write capabilities. Based on @modelcontextprotocol/server-postgres by Anthropic.

Unique: Implements MCP-level query classification and gating to enforce read-only or read-write policies before execution, preventing LLMs from executing unintended mutations through a declarative policy model

vs others: Provides application-level permission control without requiring PostgreSQL role-based access control (RBAC) configuration, making it easier to deploy with existing databases

via “read-only mode enforcement with configurable write operation restrictions”

** - Access and interact with Harness platform data, including pipelines, repositories, logs, and artifact registries.

Unique: Implements read-only mode as a startup configuration flag that conditionally registers write-capable toolsets, providing a simple but effective mechanism to prevent write operations in restricted environments. The implementation enforces read-only restrictions at the toolset registration level rather than per-operation, reducing complexity.

vs others: Provides simple read-only mode enforcement through startup flags, whereas fine-grained access control systems require complex permission management and per-operation authorization checks.

via “readonly mode enforcement for safe read-only database access”

** - Leverages your Schemas and Access Patterns to interact with your [DynamoDB](https://aws.amazon.com/dynamodb) Database using natural language.

Unique: Enforces readonly mode at tool generation time rather than runtime, so write tools are completely absent from the MCP server when readonly is enabled, providing a stronger guarantee than runtime checks that could be bypassed

vs others: Simpler and more reliable than IAM-based permission control because it's enforced in the application layer without requiring AWS credential management, making it suitable for development and testing scenarios where you want to prevent accidental writes

via “read-only mode for safe experimentation”

Explore and query Neo4j graphs with Cypher. Discover schema, run read operations, and optionally execute writes. Toggle read-only mode for safer experimentation.

Unique: Provides a built-in toggle for read-only operations, enhancing safety during data exploration compared to standard query execution tools.

vs others: Offers a more user-friendly approach to safe experimentation than manual transaction management in Neo4j.

via “read-only sql query execution”

Access your MySQL databases securely and efficiently. List databases, tables, and execute read-only SQL queries without the risk of data modification. Simplify your database interactions with a robust, read-only interface.

Unique: Utilizes a secure connection protocol specifically designed for read-only access, preventing any accidental data modifications.

vs others: More secure than traditional database clients as it enforces read-only access at the connection level.

via “read-only mode and permission enforcement”

MCP server for interacting with PostgreSQL databases

Unique: Implements read-only mode at the MCP server level, combining query-type validation with PostgreSQL RBAC to enforce least-privilege access. Allows safe deployment of LLM agents against production databases.

vs others: More secure than relying on LLM prompts to avoid writes — enforces read-only access at the database layer where it cannot be bypassed.