Langfuse MCP vs Qtcl MCP Server
A side-by-side look at the Langfuse MCP and Qtcl MCP Server MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose Langfuse MCP for monitoring work as a local process; choose Qtcl MCP Server for monitoring over a hosted endpoint. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose Langfuse MCP when
- You need dedicated capabilities in the Monitoring domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: API key required.
- You have the keys it needs:
LANGFUSE_PUBLIC_KEY, LANGFUSE_SECRET_KEY, LANGFUSE_HOST, LANGFUSE_MCP_READ_ONLY. - You want tools like
list_annotation_queues, create_annotation_queue, get_annotation_queue.
Choose Qtcl MCP Server when
- You need dedicated capabilities in the Monitoring domain.
- You prefer a remote HTTP/SSE transport.
- You want tools like
qtcl_create_wallet, qtcl_get_balance, qtcl_send_transaction.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Monitoring | Monitoring |
| Quality signal | 65/100 · Great | 48/100 · Fair |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Remote HTTP/SSE |
| Auth | API key required | Not declared |
| Pricing | Free | Not declared |
| Required env vars | LANGFUSE_PUBLIC_KEYLANGFUSE_SECRET_KEYLANGFUSE_HOSTLANGFUSE_MCP_READ_ONLY | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 112 | 0 |
| Directory activity | 6 views 0 installs 0 upvotes | 0 views 0 installs 0 upvotes |
| Tools | 48 | 11 |
| Full listing | View Langfuse MCP | View Qtcl MCP Server |
Tools & capabilities
Langfuse MCP tools 48
list_annotation_queuesList annotation queues with pagination.create_annotation_queueCreate an annotation queue.get_annotation_queueGet a single annotation queue by ID.list_annotation_queue_itemsList items in an annotation queue.get_annotation_queue_itemGet a specific annotation queue item by queue and item ID.create_annotation_queue_itemCreate an annotation queue item.update_annotation_queue_itemUpdate the status of an annotation queue item.delete_annotation_queue_itemDelete an annotation queue item.create_annotation_queue_assignmentAssign a user to an annotation queue.delete_annotation_queue_assignmentUnassign a user from an annotation queue.list_datasetsList all datasets in the project with pagination. Returns metadata about datasets including name, description, item count, and timestamps. Args: ctx: Context object containing lifespan context with Langfuse client page: Page number for pagination (starts at 1) limit: Maximum items per page (max 100) Returns: A dictionary containing: - data: List of dataset metadata objects - metadata: Pagination info (page, limit, total)get_datasetGet a specific dataset by name. Retrieves dataset details including metadata and item count. Args: ctx: Context object containing lifespan context with Langfuse client name: The name of the dataset to fetch Returns: A dictionary containing dataset details: - id: Unique dataset identifier - name: Dataset name - description: Dataset description - metadata: Custom metadata - items: List of dataset items (if included by the API) - runs: List of dataset runs (if included by the API)- +36 more on the listing page
Qtcl MCP Server tools 11
qtcl_create_walletGenerate a new post-quantum wallet address + keypairqtcl_get_balanceCheck confirmed + pending balance for any addressqtcl_send_transactionSend QTCL with flat 1-qsat fee. Supports 256-char memoqtcl_get_transactionLook up any transaction by hashqtcl_get_chain_infoBlock height, mempool depth, oracle consensus statusqtcl_get_blockBlock by height or hash with quantum coherence metricsqtcl_get_recent_transactionsLast 50 txs, filterable by addressqtcl_get_quantum_metricsLive W-state fidelity, entanglement witness, lattice coherenceqtcl_get_oracle_registry5 Byzantine consensus oracles — stake, uptime, heartbeatqtcl_get_peersActive P2P peers and topology dataqtcl_get_priceLive QTCL/USD from Pyth Network oracle feed
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
Langfuse MCP
{
"mcpServers": {
"avivsinai-langfuse-mcp": {
"command": "uvx",
"args": [
"langfuse-mcp"
],
"env": {
"LANGFUSE_PUBLIC_KEY": "YOUR_LANGFUSE_PUBLIC_KEY_HERE",
"LANGFUSE_SECRET_KEY": "YOUR_LANGFUSE_SECRET_KEY_HERE",
"LANGFUSE_HOST": "YOUR_LANGFUSE_HOST_HERE",
"LANGFUSE_MCP_READ_ONLY": "YOUR_LANGFUSE_MCP_READ_ONLY_HERE"
}
}
}
}
Qtcl MCP Server
{
"mcpServers": {
"qtcl-mcp-server": {
"url": "https://qtcl-blockchain.koyeb.app/mcp/sse"
}
}
}
Frequently asked questions
Langfuse MCP is categorized under Monitoring and uses a local stdio subprocess. Qtcl MCP Server belongs to Monitoring and uses a remote HTTP/SSE transport. Pick Langfuse MCP for monitoring work and Qtcl MCP Server for monitoring.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
Langfuse MCP is listed as free. Auth: api key required. Qtcl MCP Server has no declared pricing — check the project's own site. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add avivsinai-langfuse-mcp and qtcl-mcp-server as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, Langfuse MCP has a quality signal of 65/100 (Great) with 6 views, 0 installs and 112 GitHub stars. Qtcl MCP Server has 48/100 (Fair) with 0 views, 0 installs and 0 GitHub stars.