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feat(core): reload agents from config change feed (#39167)

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Kit Langton 2026-07-27 15:14:08 -04:00 • committed by GitHub
commit 856c569458
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3 changed files with 282 additions and 14 deletions
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43
packages/core/src/config/plugin/agent.ts
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@ -20,6 +20,8 @@ const legacySources = [
{ pattern: "{agent,agents}/**/*.md", primary: false },
{ pattern: "{mode,modes}/*.md", primary: true },
] as const
// Keep in sync with the legacySources patterns and the name-strip regex in decode.
const sourceDirectories = ["agent", "agents", "mode", "modes"] as const
const decodeAgent = Schema.decodeUnknownOption(ConfigAgent.Info)
const decodeLegacyAgent = Schema.decodeUnknownOption(ConfigAgentV1.Info)
const decodeConfig = Schema.decodeUnknownOption(Config.Info)
@ -67,7 +69,26 @@ export const Plugin = define({
})
}).pipe(Effect.map((documents) => documents.flat()))
})
const loaded = { documents: yield* load() }
const loaded = { documents: [] as Config.Document[] }
const reload = load().pipe(
Effect.tap((documents) => Effect.sync(() => (loaded.documents = documents))),
Effect.andThen(ctx.agent.reload()),
)
// One merged trigger stream serializes reloads and shares one debounce
// window; subscribing before the initial scan means updates racing the
// scan still trigger a rebuild.
const sourceChanges = config
.changes()
.pipe(
Stream.filterEffect((update) => Effect.map(config.entries(), (entries) => isAgentSource(entries, update.path))),
)
const configUpdates = ctx.event.subscribe().pipe(Stream.filter((event) => event.type === "config.updated"))
yield* Stream.merge(sourceChanges, configUpdates).pipe(
Stream.debounce("100 millis"),
Stream.runForEach(() => reload),
Effect.forkScoped({ startImmediately: true }),
)
loaded.documents = yield* load()
yield* ctx.agent.transform((draft) => {
const permissions = expandPermissions(
loaded.documents.flatMap((document) => document.info.permissions ?? []),
@ -113,19 +134,19 @@ export const Plugin = define({
}
}
})
yield* ctx.event.subscribe().pipe(
Stream.filter((event) => event.type === "config.updated"),
Stream.runForEach(() =>
load().pipe(
Effect.tap((documents) => Effect.sync(() => (loaded.documents = documents))),
Effect.andThen(ctx.agent.reload()),
),
),
Effect.forkScoped({ startImmediately: true }),
)
}),
})
// Matches anything at or under <root>/{agent,agents,mode,modes}. No file-suffix
// check: directory-level events such as renames carry no per-file paths.
function isAgentSource(entries: Config.Entry[], file: string) {
return entries.some(
(entry) =>
entry.type === "directory" &&
sourceDirectories.some((name) => FSUtil.contains(path.join(entry.path, name), file)),
)
}
function expandPermissions(rules: Permission.Ruleset, home: string): Permission.Ruleset {
// Expand only resources tools resolve as filesystem paths. Bash resources are raw shell text:
// rewriting `$HOME/private/**` would miss `$HOME/private/key`, and safe expansion needs shell-aware parsing.