passage-of-time-mcp
Provides an MCP server (FastMCP-based) exposing time-related tools for LLMs: current datetime, timestamp parsing, time differences/since, contextual time-of-day/weekend/business hours, adding time, and formatting durations. Runs an SSE transport endpoint.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
README does not describe authentication/authorization, rate limiting, or secure secret handling. TLS is not specified at the application layer (depends on deployment/proxy). Treat as potentially open-service when exposed publicly. Timezone/timestamp inputs can cause parsing edge cases; ensure robust input validation and avoid logging sensitive data if any is ever included in requests/responses.
⚡ Reliability
Best When
Used locally or behind a trusted reverse proxy for interactive LLM tooling where time calculations are needed.
Avoid When
Avoid exposing the server publicly without access controls, rate limiting, and TLS termination managed by the deployer.
Use Cases
- • LLM time awareness (e.g., “what time is it?”)
- • Computing durations and relative times in natural language
- • Contextualizing timestamps (weekend vs business hours, time of day)
- • Conversation analytics based on time deltas
- • Generating human-friendly time/duration strings for assistants
Not For
- • Production-grade, internet-exposed services without hardening (auth/rate limiting/log scrubbing)
- • Use as an authoritative time source for regulated domains without validation
- • Clients requiring REST/OpenAPI/SDK-based integration instead of MCP
Interface
Authentication
README does not mention authentication, API keys, or IP allowlisting. If deployed publicly, it is likely open to anyone who can reach the endpoint unless the deployer adds a proxy-level control.
Pricing
Self-hosted open-source; no hosted pricing stated.
Agent Metadata
Known Gotchas
- ⚠ SSE transport is called out as deprecated; tooling/clients may need to handle transport quirks.
- ⚠ Server expects strict timestamp formats; invalid formats may cause tool failures (format requirements listed).
- ⚠ Server requires a public URL for web-based clients (ngrok/reverse proxy).
- ⚠ No persistent memory of past time calculations is provided (agent must manage state if needed).
- ⚠ If exposed without auth, consider that any MCP client could query the tools.
Alternatives
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Scores are editorial opinions as of 2026-03-30.