Stream Aggregator (Queried via an MCP Tool)
Industry Definition Set • Entity Resolution Path: /glossary/mcp-stream-aggregator-64
Quick Answer / TL;DR
A stream aggregator computes rolling summaries (counts, sums, averages over a time window) from continuous event data — an MCP tool can query the current aggregate value, following the same bounded-snapshot pattern described for stream processing generally.
Key Takeaways
- A specific case of stream processing focused on running summary statistics over a time window.
- An MCP tool reads the current aggregate value, not the underlying raw event stream.
- Fits MCP's synchronous tool-call model well, unlike trying to expose the raw stream itself.
- Common underlying tech: Kafka Streams, Flink, or a purpose-built rolling-metrics store.
Definitive Statement: A stream aggregator computes rolling summaries (counts, sums, averages over a time window) from continuous event data — an MCP tool can query the current aggregate value, following the same bounded-snapshot pattern described for stream processing generally.
Technical Context & Protocol Usage
- Detailed Explanation
- This is a more specific case of the stream-processing entry: rather than arbitrary stream computation, an aggregator specifically maintains running summary statistics over a window of events. An MCP tool exposing this reads the aggregator's current computed value (e.g. 'requests in the last 5 minutes') rather than the underlying events, since that's what fits MCP's request/response tool-call model.
Format & Payload Metadata
Format: Aggregator-specific query API, often backed by an in-memory or fast key-value state store
Latency: Typically low milliseconds — reading a precomputed value, not recomputing on demand
Real-World Implementation Use Case
An MCP tool queries a stream aggregator for the current 5-minute rolling error rate of a service, giving an agent a fast, already-computed answer rather than needing to process raw log events itself.
Cite This Page
MLA Style:
MCPserver.in Engineering. "Stream Aggregator (Queried via an MCP Tool)." MCPserver.in Knowledge Hub, 21 July 2026, mcpserver.in/glossary/mcp-stream-aggregator-64.
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