What is Spanly
Spanly is an observability and monitoring platform specifically built for Model Context Protocol (MCP) servers. It provides real-time tracing, error tracking, and performance analytics for MCP traffic, working alongside existing APM tools like Datadog, Sentry, or New Relic. It requires no code changes and supports any language.
How to use Spanly
- Sign up at app.spanly.com (free tier, no credit card required).
- Install the CLI using the command:
curl -fsSL https://spanly.com/install.sh | sh - Connect your MCP server – the SDK automatically captures every tool call, resource read, and prompt request.
- View your dashboard to see real-time metrics, traces, errors, and latency breakdowns.
- Set up alerts via email, Slack, or webhooks to get notified of issues.
Features of Spanly
- Real-time MCP request tracing – see every tool call, resource read, and prompt request as it happens.
- Tool call and resource read monitoring – track usage and performance per operation.
- Error tracking with preserved prompts and arguments – debug issues with full context.
- Per-tool latency breakdown (p50/p95/p99) – identify slow operations.
- Alerting via email, Slack, and webhooks – get notified of anomalies.
- Public read-only dashboards – share metrics with stakeholders.
- Multi-region ingestion (US and EU) – low-latency data collection.
- Open-source SDK & CLI – available on GitHub.
Use Cases of Spanly
- SaaS engineering teams shipping MCP servers in production can monitor performance and errors alongside their existing APM.
- Debugging slow tool calls – identify which tools have high latency and optimize them.
- Tracking client behavior – see which AI clients (e.g., Claude Code, Cursor, Copilot) are connecting and their request patterns.
- Capacity planning – monitor request volumes and error rates across multiple servers.
Pricing
| Plan | Price (per month) | Description |
|---|---|---|
| Free | $0 | No credit card required |
| Pro | $49 | For individual developers |
| Business | $249 | For teams with advanced needs |
FAQ
Q: Does Spanly require code changes? A: No. It works with any language and requires no code modifications.
Q: Can I use Spanly alongside my existing monitoring tools? A: Yes. It is designed to complement Datadog, Sentry, New Relic, or any other APM you already run.
Q: Is there a free tier? A: Yes, the Free plan is available with no credit card required.
Q: Where is data ingested? A: Spanly supports multi-region ingestion in the US and EU.
