Arc 0.51.75 — Email, Reddit, timed-work guides and chat recall

Arc 0.51.75 — email, Reddit and timed-work guides

This Windows alpha release includes 360 substantial new guides: 120 for email assistance, 120 for Reddit posting and 120 for timed work. It also brings the changes from 0.51.72–0.51.74 to the public download channel.

New guide library

• Find the guides in Settings → Plugins under Guides. Each includes preparation, ordered steps, a worked example, verification, recovery and completion criteria.
• Guides cover email categories, reply tone, sender filters, inbox progress and duplicate-send recovery; Reddit drafts, exact approval, browser state and one-time scheduling; and clock, timezone, reminders, missed times and task handoffs.
• Automatic selection sends a compact task-relevant core to the model. Full instructions are available through the existing paged reader instead of filling the context window with the entire library.
• Fixed guide selection so pause, cancel and status requests do not select Reddit post-creation guidance. Timed-work guidance requires a matching timed intent.
• The bundled catalog now contains 21,123 workflows, including 20,887 authored guides and 236 retained upstream workflows. These are instructions for existing capabilities, not 360 new executable tools.
• No new dependencies or model downloads.

Also new since public release 0.51.71

Saved-chat recall (0.51.72). Written-chat requests can retrieve a bounded selection of relevant earlier conversations and recognized corrections. Settings → Memories includes Use past conversations; a request can use this chat only. Retrieval uses local CPU indexing, not another GPU model or training. Current instructions take priority and changing online facts still need fresh sources.

One approved Reddit post, now or later (0.51.73). Review the exact account, community, title, body and resolved time in Settings → Reddit posts. Approve once in advance, then Arc can submit that one post through the connected browser while open and awake. This replaces interval batches. Changed drafts require new approval; missed times and uncertain submissions require review instead of duplicate retries.

Questionnaire-based email assistance (0.51.74). Settings → Email assistant lets the user choose the observed mailbox, email categories, reply instructions/examples, sender filters and pace. One review starts one inbox pass. Messages are handled sequentially with fresh local-model context. Recipient/body checks, delivery records, pause/stop and uncertain-send handling help preserve control.

Scope and limits

• Email adapters initially support fixed English, paginated Gmail, Outlook and Proton layouts. Unknown layouts stop for review. Synthetic mailbox tests do not establish compatibility with every real account; live sending still needs a supervised provider trial.
• Reddit scheduling is one explicitly approved text post. Arc must remain running and awake. Login and CAPTCHA remain manual. There is no interval posting or bulk-posting capability in this release.
• Other timed-work guides support reminders, planning and handoff to available tools. They do not add a general background scheduler for research, file creation or recurring email polling.
• Guides cannot grant permissions, expand model context, promise task completion or override tool checks. No real email or Reddit post was sent during automated verification.
• Windows alpha; the installer is not Authenticode-signed. Signed updater metadata and download hashes are separate integrity checks. No new VirusTotal result is claimed.

Validation

The new library passed catalog integrity and reproducibility checks, routing tests for all 360 natural-language examples, full-reference hash/paging checks, and focused regression tests. The earlier email implementation passed 3,791 tests with 10 skips and zero failures. This release additionally runs the production UI build and packaged runtime checks, including the real reader over all bundled workflow references. The release regression run passed 44 tests with zero failures or skips. These checks do not constitute live-account testing or a new model speed/quality benchmark.

See email setup, Reddit setup, saved-chat recall, and the 360-guide index.

Download and integrity

Windows installer · Website download · Full version history

Installer: 335,240,500 bytes, approximately 320 MiB. Models are separate downloads. Normal updates preserve the separately stored workspace, conversations, settings and models.

SHA-256: 6b46b4833e93cc40ab6b1068fb1a327b16b994e76b15380810ed639bcb2ac3ad

The release assets include the installer, cumulative changelog and SHA256SUMS.txt. No matching VirusTotal report has been supplied for these exact installer bytes.