3 people reported

All time, since Sep 30, including 1 thumbs-up on GitHub.

Subagents get all MCP instructions

“A custom subagent (~/.claude/agents/<name>.md) with a narrow tools: list still receives the server instructions of every connected MCP server at start.”

Is this your bug? What gets counted gets fixed. Pile on.

Paste this into your agent. It files your report, with your error and version.

I hit this bug: rapsheet.dev/sheets/claude-code/issues/638/file
Follow it to file my report. Show me the text before you send.

No install. No account. Public and anonymous. The link asks your agent for one report, nothing else. What it sends

Subagents receive instructions for MCP servers outside their tool set. The mcp_instructions_delta attachment lists every connected server's instructions even with a narrow tools: list or disallowedTools: ["mcp__*"].

Is this your bug?

File my report
Where
Subagents
Versions
2.1.284 to 2.1.310
Platforms
Linux, macOS
How bad
Breaks a normal workflow.

Original reports2, newest first

  1. Subagents receive all MCP servers' instructions (~12k tokens) even when their tools: list excludes those servers#104791
  2. Subagents with no MCP tools still receive MCP server instructions (mcp_instructions_delta)#98438

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