Readonly Mode Enforcement For Safe Read Only Database Access

via “read-only mode enforcement with selective tool disabling”

Create and manage Asana tasks, projects, and workspaces via MCP.

Unique: Implements access control at tool registration layer rather than runtime, preventing write tools from appearing in MCP client UI entirely when read-only mode is enabled, rather than accepting requests and rejecting them

vs others: More secure than runtime permission checks because tools are completely unavailable to clients, eliminating risk of permission bypass bugs or accidental mutations

via “read-only mode enforcement for write operation prevention”

Provides Model Context Protocol (MCP) integration and tooling for Azure in Visual Studio Code.

Unique: Implements write-blocking at the MCP server boundary before operations reach Azure APIs, providing a hard security boundary that cannot be bypassed by agent prompting or client-side manipulation. Operates as a global toggle rather than per-tool configuration, simplifying deployment but reducing flexibility.

vs others: Simpler to configure than per-operation RBAC but less flexible than Azure's native RBAC; provides defense-in-depth by blocking writes at the MCP layer in addition to Azure's own permission checks.

via “read-only mode enforcement with write operation blocking”

A Model Context Protocol (MCP) server for interacting with Microsoft 365 and Office services through the Graph API

Unique: Implements read-only enforcement at the tool registration layer, validating operation type before Graph API execution rather than relying on API-level permissions. Uses CLI flag and environment variable configuration for deployment flexibility.

vs others: More practical than API-level read-only because it prevents accidental writes at the application layer without requiring separate service principal setup. More auditable than relying on Graph API scopes because it's explicitly configured and logged.

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 “write operation safety constraints”

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

Unique: Implements multi-level write constraints (read-only mode, table whitelisting, operation-level permissions) at the MCP handler level, allowing fine-grained control over LLM write access without requiring database-level role management

vs others: Provides application-level write safety constraints that are easier to configure and audit than database role-based access control, enabling rapid iteration on LLM agent permissions

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 deployment mode for restricted access”

** - Search dashboards, investigate incidents and query datasources in your Grafana instance

Unique: Implements read-only deployment mode that disables all write operations at the tool execution layer, enforced across all transport modes and authentication contexts. Enables restricted access deployments without requiring separate server instances or custom authorization logic.

vs others: Server-level read-only enforcement vs relying on API key permissions — provides defense-in-depth by preventing write operations even if API key has write permissions, simplifies access control for restricted deployments, and enables safe sharing of mcp-grafana with external parties.

via “read-only mode with operation-level access control”

** - A Model Context Protocol Server for MongoDB

Unique: Implements read-only enforcement at the MCP tool layer (blocking tool registration) rather than at the MongoDB driver level, meaning write operations never reach the database and LLM clients receive immediate rejection with clear error messages

vs others: Simpler and more explicit than MongoDB role-based access control (RBAC) for LLM use cases, since it doesn't require managing MongoDB user accounts or connection strings per deployment

via “non-destructive and read-only operation modes”

** - Connect to Kubernetes cluster and manage pods, deployments, services.

Unique: Implements operation modes at the MCP server layer, enforcing restrictions uniformly across all clients without relying on RBAC alone. Modes are configured at startup and cannot be bypassed by individual clients.

vs others: More reliable than RBAC-only controls because operation restrictions are enforced at the application layer, preventing accidental modifications even if RBAC is misconfigured or overly permissive.

via “read-only-safety-enforcement”

Anchord MCP is a hosted remote MCP server backed by the Anchord API. It helps AI agents resolve canonical customer identities, inspect linked records and targets, detect ambiguity, and evaluate proposed writes before acting. Anchord is read-only and never performs external writes.

Unique: Implements read-only enforcement at the MCP protocol layer, rejecting write requests before they reach Anchord's API. This prevents agents from even attempting writes, providing a hard safety boundary rather than relying on API-level permissions.

vs others: More secure than API-level read-only enforcement because it prevents write attempts at the protocol layer, reducing attack surface and ensuring agents cannot bypass restrictions through API manipulation or credential escalation.

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 “strict read-only enforcement with dual-layer validation”

** - Query your [ClickHouse](https://clickhouse.com/) database server.

Unique: Implements dual-layer read-only enforcement: server-side detection via get_readonly_setting() function that checks ClickHouse read_only setting and applies client constraints, combined with MCP tool schema that restricts run_select_query to SELECT statements only. This prevents both server-level write operations and protocol-level bypass attempts.

vs others: More secure than single-layer enforcement because it combines server-side setting detection with client-side validation, preventing bypass through either layer independently. Unlike generic database tools that rely solely on database permissions, this approach enforces read-only at the MCP protocol 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.