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Code Mode resends the whole tool catalog on every inventory change #60128
Description
Description
In Code Mode a single tool being added or removed re-sends the entire catalog block (~8.8k characters) instead of saying what changed. In one long session on 2.2.0 I measured 120 catalog notices, 1,375,313 characters (~340k tokens), and 15 notices that were byte-identical to an earlier one.
Two things combine:
packages/core/src/codemode/catalog.tssummarize()spreads a fixedINLINE_BUDGETacross namespaces and rotates which listings are inlined, so adding one tool shifts what the other namespaces show.packages/core/src/codemode/instructions.tsupdate()compares that sample and answers any difference with a replacement block.
Sampling rotation and a real inventory change are therefore indistinguishable on the wire, and one changed tool costs the whole catalog.
Steps to reproduce
- Run
opencode serve, create a session. - Send a turn, then toggle an MCP server:
POST /api/experimental/mcp/gh_grep/disconnect, then the same path with/connect. - Repeat, then count the Code Mode notices: rows in
session_messagewheretype='system'andmetadata.instructionSourcescontainscore/codemode.
Six toggles produce 57,072 characters of notices on 2.2.0.
OpenCode version
2.2.0
Operating System
Windows 11
Terminal
Windows Terminal
Fix: #60129
Activity
opencodejr commentedon Oct 29, 2026
Thanks for the detailed measurements and the clear pointer to
summarize()andupdate().I think this is a duplicate of #55529. It reports the same thing: when the Code Mode tool inventory changes (MCP reconnect, browser attach/detach), the whole catalog is re-injected, because the shared inline budget moves which entries are shown and
update()then falls back to the full catalog block.Possible duplicates and related issues, ordered by likelihood:
search(...)" notice instead of the full catalog.Your 2.2.0 numbers and the MCP disconnect/connect repro would be useful on #55529, so feel free to add them there.
The bot will close this issue as a duplicate in 1 day unless you reply explaining how your problem is different.
opencodejr commentedon Oct 30, 2026
Closing this as a duplicate of #55529, as mentioned yesterday. There's been no reply saying how this differs. That issue tracks the same problem: a change to the Code Mode tool inventory re-sends the whole catalog. PR #57090 is open to address it.
Your 2.2.0 measurements and the MCP disconnect/connect steps would still help on #55529, so please add them there. If your case turns out to be different, reply here and we can reopen.