feature
Claude Code

Increased MCP tool descriptions character limit from 2,048 to 4,096

code.claude.comagent

The default character limit for MCP tool descriptions sent front-end and at instruction level increased to 4,096 characters. This allows more detailed tool descriptions without explicit configuration, improving context available for tool use.

Stacks this affects

Claude Code ships in 4 tested stacks here.

Claude Code MCP setup
Code · Agent setup
$50/mo
Claude Code setup
Code · Agent setup
$50/mo
Claude Code only
Code · Workflow
$50/mo
Ship code with AI
Code · Workflow
$50/mo
All Claude Code changes and pricing

More Claude Code

featureSonnet 5.5 cache read pricing reduced from $0.20 to $0.10 per million tokensfeatureAdded allow_large option to Read tool for reading text files larger than default limitsfeatureAdded autoCompactWindow to subagent frontmatter for earlier context compressionfeatureAdded CLAUDE_CODE_WORKFLOW_SUBAGENT_MODEL environment variable for workflow model selectionreleaseClaude Haiku 5.5 released as default Haiku model