Bus storage is unstorage: delete bespoke storage code, consumers pick the driver

[Tyler-R-Kendrick]

Summary

Replaces the harness's homegrown storage layer with unstorage. The bus now owns zero storage logic: it takes any unstorage instance, and the consumer picks the driver — memory, fs, redis, http, cloud KV, or anything else in the driver ecosystem.

Changes

Harness package

• AgentBusSettings.storage accepts any unstorage Storage; unset, the bus uses unstorage's default in-memory driver. Entries live under the storage's entry:* keys, sorted by sequence on load, still parsed at the boundary with the zod entry schema so malformed values never enter the log. A bus expects sole write access to its entry:* keys; shared storages should be mounted or prefixed.
• Deleted outright: JsonlBusStore, BusFileSystem, the AgentBusStore seam, all JSONL serialization/recovery code, and the memfs dependency. unstorage is the storage abstraction — nothing bespoke remains.

Root package

• HarnessLoopOptions.bus/actionLogFile become one storage factory: (input: TrainingLoopInput) => Storage. Unset, a run's entries land on the local filesystem via the fs driver under <outputDir>/harness-actions (defaultActionLogDir). judge and contextProvider stay injectable as before.

Docs

• Harness and root READMEs document the unstorage seam and driver choice; examples build the bus with createStorage({ driver: fsDriver(...) }).

Testing

• npm run check passes (typecheck for all packages, 81 tests across 15 files, package build), including a driver-swap test (memory driver with an out-of-band writer, sequence resumption) and an fs-driver persistence test across bus instances.

🤖 Generated with Claude Code

https://claude.ai/code/session_01NG6fSKqgt8nD7JnEY9q245

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: fb0a63eb-a1ac-413c-aa9e-c3fd134eacd7

📥 Commits

Reviewing files that changed from the base of the PR and between 578c640 and abe53ea.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (10)

• README.md
• package.json
• packages/harness/README.md
• packages/harness/package.json
• packages/harness/src/bus.ts
• packages/harness/src/index.ts
• packages/harness/src/jsonl-store.ts
• packages/harness/test/harness.test.ts
• src/index.ts
• src/providers/harness.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/interface-redundancies-consolidate-8juzw3

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