Configuration

All fields are optional and stack in two layers:

The settings.yaml user layer (the fast-compaction: section of ~/.dsh/settings.yaml) — wins per field and applies live to subsequent compactions: the engine watches the settings service's hot-publish and rebuilds the Jev transport in place when apiKey/model/baseUrl change, so no restart is needed. The friendly editor is this package's own Web settings card (web/, the fast-compaction-dsh/client entry) on the Plugins page (apiKey rides as a secret role field — only a set/unset flag ever crosses the wire).
The preset patch config: (composition layer) — the per-preset base values; changes require a DSH restart.

Per-field precedence: settings.yaml user layer > preset config: > environment (apiKey only, via TYPESAFE_API_KEY) > code defaults. Unlisted fields pass through to compaction-basic (thresholdRatio, retainRatio, retainTokens, summarizationProvider, summarizationModel, maxTokens, compactionRetries, maxOverflowRetries, modelPolicies, auto).

Note: a settings section whose values fail the schema (e.g. a string in keepThreshold) disables the whole settings layer and falls back to the composition layer, with a warning in the log; the layer retries on the next process start.

Field	Default	Meaning
`apiKey`	`TYPESAFE_API_KEY`	TypeSafe API key
`model`	`jev-latest`	Jev model name
`baseUrl`	`https://api.typesafe.ai/v1/systemone`	System One endpoint
`keepThreshold`	`0.5`	Minimum keep probability for a call or result to stay
`preserveRecentMessages`	`6`	Newest messages never touched (the first is always kept)
`maxStateTokens`	`25000`	Estimated token ceiling for the state
`maxRequestTokens`	`30000`	Estimated ceiling for state plus one batch of questions
`truncateHeadChars`	`300`	Characters of a dropped tool result retained before its note
`minReduction`	`0.25`	Fall back to the built-in summary below this reduction ratio
`disabled`	`false`	Use only the built-in summarizer

fast-compaction-dsh

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Configuration