Unverified50% confidenceFactExact time
The Claude Agent SDK by default uses tool search to lazily load MCP tool schemas, to avoid a large server occupying the context window from the start.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/27/2026
First Seen
Valid until: 1/25/2027
Sources
Claude Agent SDK in Practice: Building Your First AI Agent Step by Step
youtubeARE AGI10/27/2026
Related Entities
Related Claims
UnverifiedWhen Claude Code starts, it only loads the names of MCP tools, and only searches for and loads the full documentation of the corresponding tool when a task needs it; this mechanism is called 'tool search'.70% similarUnverifiedIn the Claude Agent SDK, the fully qualified name of an MCP tool is mcp__servername__toolname (joined with double underscores), and this full string must appear in the allowed list exactly as is, otherwise the call falls to permission mode.70% similarUnverifiedMature Harnesses generally have lazy tool discovery capability when mounting large numbers of MCP tools, avoiding the token cost of carrying the full tool schema on every request, whereas early DSH did not possess this capability.69% similarVerifiedWhen MCP tools occupy more than 10% of the context window, Claude Code automatically switches to Tool Search Mode.68% similarUnverifiedThe search capability in Agent-Reach is accessed via MCP, running as an MCP Server, and can perform web-wide retrieval without requiring an API Key.68% similar
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