Schema Overhead Consumes 16-50% of Context Window

9/10 Critical

Full tool schemas load into context on every request with no lazy loading, selective injection, or summarization. This causes context window exhaustion before meaningful work begins, with confirmed instances ranging from 45K tokens for a single tool to 1.17M tokens in production deployments.

MCP
Category
performance
Workaround
hack
Stage
deploy
Freshness
persistent
Scope
framework
Upstream
open
Recurring
Yes
Buyer Type
team
Maintainer
active

Sources

Collection History

Query: “What are the most common pain points with MCP for developers in 2025?”4/7/2026

Schema overhead eating 16–50% of context window before the conversation starts... The full tool schema loads into context on every request. There's no lazy loading, no selective injection, no summarization. Just the entire schema, every time.

Created: 4/7/2026Updated: 4/7/2026