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Claude Code's tool search defers 40k tokens, but auto:5 mode loads them all

By PulseAugur Editorial · [1 sources] ·

Claude Code's tool search feature, enabled by default, defers tool definitions to conserve context window space. When tool search is active, the initial request for a Claude Code session uses significantly fewer tokens by only including tool names and server instructions, rather than the full schema of 88 deferred tools. However, the 'auto:5' threshold mode unexpectedly loaded all deferred tools, indicating a potential issue with its boundary handling. AI

IMPACT This behavior impacts how developers interact with AI tools, potentially affecting efficiency and context management in AI-assisted coding.

RANK_REASON The item discusses a specific feature's behavior and performance within a software product, rather than a new release or major industry shift.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Claude Code's tool search defers 40k tokens, but auto:5 mode loads them all

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31 / 100
Composite score across the factors below. Higher = stronger signal that this story matters right now.
Newsworthiness bucket
Tool
The item discusses a specific feature's behavior and performance within a software product, rather than a new release or major industry shift.
Source corroboration
Single-source cluster
Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
Topics
product, infra
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High
Clearly on-topic for AI-industry coverage.
Story freshness
Breaking (< 6h)
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Full methodology in our editorial standards.

COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · Rulestack ·

    Tool search hid 40,170 tokens from our first request. auto:5 put them all back

    <blockquote> <p>With MCP tool search on, which is the default, the first request of a fresh Claude Code session on our machine carried 20,819 input tokens. With <code>ENABLE_TOOL_SEARCH=false</code> the same request carried 60,989. The difference, about 40,170 tokens, is 88 tool …

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