Skip to content
Agentmart
Submit a tool

spanlens/mcp-server

Query Spanlens LLM observability from Cursor, Claude Desktop, or Continue.

Connector by spanlens · GitHub account verified by the MCP Registry

IndexedMITLocal (stdio)★ 13
Write a review

Install

Works with Claude Code, Codex, VS Code, Cursor, Windsurf, Claude Desktop. Read the repository before you give any tool access to your data.

npx agentmarket install connector/spanlens-mcp-server

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

Get the weekly diff

The weekly diff: one email a week with new agent tools, notable updates and grade changes, plus security alerts for tools you follow. Double opt-in, one-click unsubscribe.

We use your email only for this newsletter. Privacy

About

Query Spanlens LLM observability from Cursor, Claude Desktop, or Continue via MCP.

Use cases: monitoring-observability

Reviews

Write a review

No reviews yet. Installed it? Reviews come from verified installers only. How reviews work

Permissions

What this server can do and what it asks for, from its tool list, install config and code. Checked Oct 25, 2026.

Tools
7 read · 0 write · 0 deleteRead-only
Secrets
1 (API keys, tokens or passwords)
Install scripts
None found
Runs as
Node.js package

Tools by what they do 7

Read from the source code; the running server may list different tools.

Read 7 · Look things up without changing anything.

  • get_anomalies
  • get_savings
  • get_stats
  • get_trace
  • get_user_analytics
  • list_traces
  • query_requests

Secrets and settings it asks for

Secrets: values you paste in that let it act as you.

  • SPANLENS_API_KEY

Other settings (environment variables or headers).

  • SPANLENS_BASE_URL

Network hosts it talks to 3

  • api.spanlens.io · found in code
  • github.com · found in code
  • spanlens.io · found in code

Tools (7)

Read from the source code; the running server may differ. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • get_anomalies

    List unacknowledged cost / latency / error-rate anomalies the platform has detected. Each anomaly carries a `deviations` field (how many sigmas off baseline). Use when the user asks "anything weird going on?", "any spikes?", or wants a quick health check.

  • get_savings

    List model-swap recommendations the platform thinks would save money without losing quality. Each item carries projected monthly savings, prior-window cost, and an `achieved` flag if the swap has already been adopted.

  • get_stats

    Get aggregate LLM cost, request count, latency, and error-rate stats for the workspace. Use when the user asks about spend, usage volume, or how things have been going.

  • get_trace

    Fetch the full span tree for a single agent trace by id — every llm/tool/retrieval span with timing, tokens, and cost. Use when the user names a trace, asks why one was slow, or asks what an agent did step by step. Pair with list_traces if you need to discover the trace id first.

  • get_user_analytics

    Get per-end-user usage breakdown — total requests, cost, latency, models used, recent calls. The 'user' here is the customer's end-user, identified by the `x-spanlens-user` header the SDK attaches.

  • list_traces

    List agent traces with optional filters. Use to discover trace IDs to feed into get_trace, or to scan recent agent runs. Returns trace summaries (name, status, duration, span count, total tokens, total cost). Does NOT include individual span data — call get_trace with a trace ID for that.

  • query_requests

    List individual LLM requests with cost, latency, model, status, and error message. Use when the user wants to see specific calls — recent ones, errors only, particular model, particular user, etc.

Compare and alternatives

    Featured in

    Signals

    Stars
    13
    Forks
    1
    Open issues
    1
    Last commit (this folder)
    Sep 28, 2026 (1 month ago)
    Last release
    Sep 28, 2026 (1 month ago)

    From GitHub (fetched Oct 24, 2026).

    Details

    Registry name
    io.github.spanlens/mcp-server
    Version
    0.3.0
    Auth
    API key
    Packages
    npm @spanlens/mcp-server
    License
    MIT
    Repository
    github.com/spanlens/Spanlens
    First seen
    Oct 24, 2026
    Last checked
    Oct 24, 2026
    Source
    Official MCP Registrygithub-graphql
    Cite this page

    spanlens/mcp-server. Agent Mart. https://agentmart.dev/connectors/spanlens-mcp-server (last updated 2026-10-24)