sirens-echo#635 measured 87% of a member's Steam library discarded into a
16 KiB cap, and its sharpest line was not about the number:

  The flat ceiling across tools is more suspect than its value.

One bound covered all 52 tools, so a cap that suits list_channel-message
governed get_owned_games too, and no value could suit both.

ModelBudget gains tool_result_bytes_by_tool, keyed by the model-facing
tool name. An absent key inherits tool_result_bytes, so every deployed
definition resolves to exactly the byte count it resolves to now. No tool
is given an override here.

Zero is refused rather than read as unset. An absent key already means
inherit, so a present zero would mean deliver nothing, which is never
what anyone configuring a ceiling meant.

The span's mcp.tool.limit_bytes now reports the bound that actually
applied rather than the budget-wide one, so #635's third acceptance line
keeps holding once bounds differ per tool.

The map makes ModelBudget non-comparable, so one existing test moves to
reflect.DeepEqual. Its assertion is unchanged.

This is the mechanism only. The sizing decision stays on #362, which is
Kai's, and deriving context limits from the model window is untouched.

Refs sirens-echo#635, sirens-echo#362

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Co-authored-by: Kai Siren <coilysiren@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>

coilyco-ops requested review from coilysiren

2026-08-13 20:55:07 +00:00

coilyco-ops referenced this pull request

2026-08-13 20:55:28 +00:00

Sized for a small model: 87% of a member's Steam library was discarded into a 16 KiB cap, on a turn that used 4.8% of the context window #635

coilyco-ops merged commit 1caf8ea4cb into main

2026-08-13 20:56:29 +00:00

coilyco-ops referenced this pull request from a commit

2026-08-13 20:56:30 +00:00

Merge pull request 'feat(budget): a tool may name its own result bound, defaulting to the ceiling' (#725) from coilyco-ops/per-tool-result-bound into main

coilyco-ops referenced this pull request

2026-08-13 21:06:07 +00:00