mcp_sse (Elixir)
MCP ServerFree** An SSE implementation in Elixir for rapidly creating MCP servers.
Capabilities8 decomposed
sse-based mcp server transport layer
Medium confidenceImplements Server-Sent Events (SSE) as the underlying transport protocol for MCP (Model Context Protocol) servers, enabling bidirectional communication between clients and MCP servers over HTTP without requiring WebSocket infrastructure. Uses Elixir's lightweight process model to manage persistent SSE connections, routing incoming client messages to handler processes and streaming responses back through the SSE event stream with automatic reconnection handling.
Uses Elixir's lightweight process-per-connection model with OTP supervision to manage SSE streams, avoiding thread pools and enabling thousands of concurrent connections with minimal memory overhead. Provides MCP-specific message routing and serialization built directly into the transport layer rather than as a separate middleware concern.
More memory-efficient than Node.js/Python SSE implementations for high-concurrency scenarios due to Erlang VM's process scheduler, and simpler than WebSocket-based MCP servers for deployment in HTTP-only infrastructure
mcp protocol message serialization and routing
Medium confidenceHandles JSON-RPC 2.0 message parsing, validation, and routing to appropriate MCP handler functions based on the 'method' field in incoming requests. Automatically serializes responses back to JSON-RPC format with proper error handling, request ID correlation, and support for both request-response and notification message patterns defined in the MCP specification.
Leverages Elixir's pattern matching to define MCP handlers as simple function clauses, eliminating switch statements or handler registries. Uses Elixir's pipe operator for composable message transformation and validation chains.
More concise than Python/Node.js MCP implementations because Elixir's pattern matching directly maps JSON-RPC methods to handler functions, reducing boilerplate compared to explicit dispatch tables
rapid mcp server scaffolding and handler generation
Medium confidenceProvides Elixir macros and DSL constructs to quickly define MCP server endpoints (resources, tools, prompts) with minimal code. Automatically generates the required MCP message handlers, response formatting, and protocol compliance boilerplate, allowing developers to focus on business logic rather than protocol mechanics.
Uses Elixir compile-time macros to generate MCP handlers at module definition time, eliminating runtime reflection and enabling zero-cost abstractions. Integrates with Elixir's module system for automatic handler registration and supervision.
Faster development than hand-written MCP servers in any language due to macro-based code generation, and more type-safe than Python/JavaScript implementations that rely on runtime introspection
connection lifecycle management with automatic reconnection
Medium confidenceManages SSE connection state, including client connection establishment, heartbeat/keepalive signaling, graceful disconnection, and automatic client reconnection with exponential backoff. Uses Elixir processes to track connection state and implement timeout-based cleanup of stale connections, ensuring resource efficiency in long-lived server deployments.
Implements connection lifecycle as Elixir GenServer processes with built-in timeout handling via Erlang's timer system, enabling precise control over connection cleanup without manual polling. Uses OTP supervisor trees to automatically restart failed connections.
More robust than manual connection management in Python/Node.js because Erlang VM's process model provides built-in fault tolerance and automatic cleanup, reducing connection leak bugs
concurrent mcp request handling with process isolation
Medium confidenceSpawns isolated Elixir processes for each incoming MCP request, enabling true concurrent request handling without blocking other clients. Each request process has its own memory context and error handling, preventing cascading failures where one slow or failing request impacts other active connections.
Leverages Erlang VM's lightweight process model to spawn a new process per request with automatic garbage collection and memory isolation, enabling thousands of concurrent requests with minimal overhead. Integrates with OTP supervisor patterns for automatic failure recovery.
Dramatically more efficient than thread-per-request models in Python/Java because Erlang processes are 1000x lighter than OS threads, enabling true concurrency without thread pool exhaustion
mcp resource server implementation
Medium confidenceProvides abstractions for implementing MCP resource servers that expose files, documents, or data structures as queryable resources. Handles resource listing, resource content retrieval, and resource URI resolution according to the MCP resource server specification, with support for hierarchical resource organization and resource metadata.
Integrates with Elixir's pattern matching to define resource handlers as simple function clauses matching URI patterns, eliminating explicit routing logic. Supports lazy resource loading and streaming for large resource sets.
More concise than Python/Node.js resource servers because pattern matching directly maps URI patterns to handler functions, reducing boilerplate compared to regex-based routing
mcp tool server implementation with parameter validation
Medium confidenceProvides abstractions for implementing MCP tool servers that expose callable functions as MCP tools. Handles tool definition (name, description, parameters), parameter validation against JSON schemas, tool invocation, and result formatting according to MCP tool server specification. Supports both synchronous and asynchronous tool execution.
Uses Elixir's function introspection and pattern matching to automatically generate tool schemas from function signatures, reducing manual schema definition. Supports both pure functions and side-effect-bearing functions with automatic async wrapping.
More ergonomic than Python/Node.js tool servers because Elixir's pattern matching and pipe operator enable concise tool handler definitions without explicit parameter unpacking or error handling boilerplate
http server integration and request routing
Medium confidenceIntegrates with Elixir HTTP servers (Phoenix, Plug, or raw Cowboy) to expose MCP endpoints as HTTP routes. Handles HTTP request parsing, SSE stream setup, request body extraction, and response streaming. Provides middleware hooks for authentication, logging, and request/response transformation.
Provides Plug-compatible middleware for MCP request handling, enabling seamless integration with existing Phoenix applications and middleware stacks. Uses Elixir's pipe operator for composable request/response transformation.
More integrated with Elixir web frameworks than standalone MCP libraries, enabling reuse of existing Phoenix middleware and routing infrastructure
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
Related Artifactssharing capabilities
Artifacts that share capabilities with mcp_sse (Elixir), ranked by overlap. Discovered automatically through the match graph.
inspector
Visual testing tool for MCP servers
openmcp-core
Core domain types for Model Context Protocol (MCP) tool generation
mcp-sdk-client-ssejs
Client transport alternative of @modelcontextprotocol/sdk/client base on sse.js. The main purpose is make it working on React Native with llama.rn.
mcp-framework
Framework for building Model Context Protocol (MCP) servers in Typescript
@modelcontextprotocol/server-basic-solid
Basic MCP App Server example using Solid
llm-analysis-assistant
** <img height="12" width="12" src="https://raw.githubusercontent.com/xuzexin-hz/llm-analysis-assistant/refs/heads/main/src/llm_analysis_assistant/pages/html/imgs/favicon.ico" alt="Langfuse Logo" /> - A very streamlined mcp client that supports calling and monitoring stdio/sse/streamableHttp, and ca
Best For
- ✓Elixir developers building MCP servers for Claude or other MCP-compatible clients
- ✓Teams deploying MCP servers in HTTP-only environments (corporate proxies, edge networks)
- ✓Rapid prototypers building proof-of-concept MCP integrations
- ✓Developers familiar with Elixir's OTP patterns seeking MCP transport abstraction
- ✓Elixir developers implementing MCP resource servers or tool servers
- ✓Teams building MCP integrations for Claude or other MCP clients
- ✓Developers who want MCP protocol compliance without manual JSON-RPC handling
- ✓Rapid prototypers building MCP proof-of-concepts
Known Limitations
- ⚠SSE is unidirectional by design — requires client polling or separate HTTP POST channels for true bidirectionality, adding latency vs native WebSocket implementations
- ⚠No built-in message queuing or persistence — dropped connections lose in-flight messages unless explicitly handled by the application layer
- ⚠Elixir-only implementation — no Python, Node.js, or Go bindings available
- ⚠Requires understanding of Elixir/OTP supervision trees and process management for production deployments
- ⚠SSE connection limits per browser/domain may apply in web-based client scenarios
- ⚠No built-in schema validation — developers must manually validate request parameters against MCP schemas
Requirements
Input / Output
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** An SSE implementation in Elixir for rapidly creating MCP servers.
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