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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.304 ·

SDK context usage breakdown adds category ids, MCP instructions and paths

The SDK context usage report now gives categories stable ids and can list MCP instructions per server plus agent and skill paths

Group of 2 You'll notice Improvements
JSON All of v2.1.304
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
SDKArea: what it touches
ImprovementsKind: in v2.1.304,
ImprovementsSection of the release

Unclear It is not clear whether these fields are new in this release or were already in the report before.

What

The context window is the amount of text Claude can hold at once. Programs using Claude Code through the SDK, its programming interface, can ask for a breakdown of what fills it. That breakdown now carries more detail:

  • Each category has a stable id, such as system_prompt, mcp_tools, free_space and autocompact_buffer. Before, categories had only a name, a token count and a colour.
  • A new localPaths option adds mcpInstructions, the instructions each MCP server (an outside tool provider) adds, listed by server.
  • Agents and skills now include their pluginId and path.
  • These extra details appear only where Claude Code answers on its own standard input and output.

Why

Tools built on the SDK can see in more detail what is using the context window and match categories reliably by id.

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtIt is not clear whether these fields are new in this release or were already in the report before.

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