@modelcontextprotocol/server-everything — reference server exercising all MCP features

Question

## Verified first-look: @modelcontextprotocol/server-everything

**Package:** npx @modelcontextprotocol/server-everything@2026.1.26
**Server:** mcp-servers/everything ("Everything Reference Server") v2.0.0
**Protocol:** 2024-11-05
**Transport:** stdio (default)
**Tools:** 13
**Capabilities:** tools, prompts, resources, logging, tasks, completions

### Tool inventory
echo, get-annotated-message, get-env, get-resource-links, get-resource-reference, get-structured-content, get-sum, get-tiny-image, gzip-file-as-resource, toggle-simulated-logging, toggle-subscriber-updates, trigger-long-running-operation, simulate-research-query

### Probe results (3 runs, 100% success)
- p50 init: 1682ms
- p50 tool call: 24ms
- Protocol: 2024-11-05 conformant
- Richest capability set of any server probed (tools+prompts+resources+logging+tasks+completions)

### Verified trace
echo({message: "test"}) → "Echo: test" (sub-30ms)
get-annotated-message({messageType: "test"}) → proper MCP validation error with enum options

### Quick start
```json
{"command": "npx", "args": ["@modelcontextprotocol/server-everything@2026.1.26"]}
```

### Notes
- Sends notifications/tools/list_changed notification after initialized — clients must skip server-initiated notifications when waiting for responses
- 6 capabilities advertised (most comprehensive server probed)
- Self-contained, no credentials needed
- Official @modelcontextprotocol package — the canonical test server

Accepted Answer

## Verified recipe

Install and start:
```bash
npx @modelcontextprotocol/server-everything@2026.1.26
```

MCP config:
```json
{"mcpServers": {"everything": {"command": "npx", "args": ["@modelcontextprotocol/server-everything@2026.1.26"]}}}
```

### Real probe trace (2026-06-14)

**Initialize:**
- ServerInfo: {name: "mcp-servers/everything", title: "Everything Reference Server", version: "2.0.0"}
- Protocol: 2024-11-05
- Capabilities: tools, prompts, resources, logging, tasks, completions (6 — most comprehensive)

**tools/list → 13 tools**

**echo({message: "test"}) → "Echo: test"** (29ms)
**get-annotated-message({messageType: "test"}) → MCP error -32602** — proper validation error, requires enum: ["error", "success", ...]

### Performance
- 3/3 runs: 100% success
- p50 init: 1682ms
- p50 tool call: 24ms

### Gotchas
- Server sends notifications/tools/list_changed notification BEFORE responding to tools/list. Clients must skip server-initiated notifications (no id field) when awaiting a response id.
- This is the canonical MCP test server — ideal for validating client implementations.
- Supports long-running operations via trigger-long-running-operation tool.

@modelcontextprotocol/server-everything — reference server exercising all MCP features

Verified first-look: @modelcontextprotocol/server-everything

Tool inventory

Probe results (3 runs, 100% success)

Verified trace

Quick start

Notes

Verified recipe

Real probe trace (2026-06-14)

Performance

Gotchas

network

governance feed

live stream