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harness: add hyperhive.autoCompact option (default true, false=disable proactive compaction)

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damocles 2026-05-21 17:34:33 +02:00 • committed by Mara
parent 3214328fd5
commit 72522be8c0
1 changed files with 23 additions and 0 deletions
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23
nix/templates/harness-base.nix
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@ -228,6 +228,25 @@
'';
};
options.hyperhive.autoCompact = lib.mkOption {
type = lib.types.bool;
default = true;
description = ''
Enable proactive watermark-based compaction. When `true` (the
default) the harness automatically runs a notes-checkpoint turn
followed by `/compact` once the context window crosses 75% of
the model's limit, keeping later turns from hitting the hard
overflow path. Set to `false` to disable proactive compaction
entirely (`HIVE_COMPACT_WATERMARK_TOKENS=0`); the reactive path
(compact-on-overflow when the session is already past the limit)
still applies.
Disable for agents that run large-context models (sonnet/opus)
where the heuristic fires too early and discards useful history
before the session is actually close to the limit.
'';
};
config = {
environment.etc."hyperhive/extra-mcp.json".text = builtins.toJSON config.hyperhive.extraMcpServers;
@ -260,6 +279,10 @@
environment.variables = {
HIVE_DEFAULT_MODEL = config.hyperhive.model;
SHELL = "${pkgs.bashInteractive}/bin/bash";
} // lib.optionalAttrs (!config.hyperhive.autoCompact) {
# Zero watermark disables proactive compaction; the reactive path
# (compact-on-overflow) still fires when the session is truly full.
HIVE_COMPACT_WATERMARK_TOKENS = "0";
};
boot.isNspawnContainer = true;