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implement session usage RFD #415

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implement session usage RFD #415

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@SteffenDE SteffenDE commented Jan 27, 2026

Implements #316.
@SteffenDE SteffenDE requested a review from a team as a code owner January 27, 2026 14:51
@SteffenDE SteffenDE mentioned this pull request Jan 28, 2026
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benbrandt pushed a commit to zed-industries/claude-code-acp that referenced this pull request Jan 29, 2026
@SteffenDE
allow using /context command (#268)
11ca660 
I experimented with https://agentclientprotocol.com/rfds/session-usage
(see
agentclientprotocol/agent-client-protocol#415),
but the Claude Agent SDK does not seem to return the information we need
for an accurate context indicator. For example, one request to explore a
project returned 500k+ cached read tokens in Claude's `result` message,
while the agent reported 64k tokens used. I can open a PR with those
changes for reference once the Typescript SDK is updated.

To allow users to still see the current context usage, allowing to run
`/context` seems to be the second best option. This PR changes the code
to handle the `<local-command-stdout>` message that the SDK generates
when sending `/context` and includes `/context` as allowed command.

Screenshot from Tidewave with this change:

<img width="460" height="1079" alt="image"
src="https://github.com/user-attachments/assets/a3796e46-4014-4988-a993-e13d38d38d96"
/>
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