Cos 1.0.2

Cos 1.0.2

Cos 1.0.2 fixes browser tool execution and cleans up the expandable work trace.

Fixes

• Recovers a valid first Cos tool call when a model omits the closing </cos-tool> tag or tries to batch several calls in one response.
• Never renders internal <cos-tool> protocol in the visible assistant reply, including in tasks saved by 1.0.1.
• Retries malformed tool protocol privately instead of exposing it to the user.
• Formats streamed reasoning summaries as readable plain-text lines instead of joined Markdown markers.
• Restores BetterWright navigation for GPT-5.6 Luna and other lightweight models that use Cos's text-tool harness.
• Keeps the Browser pane attached to the task session while tools navigate it.
• Replaces the shallow Computer Use scan with a Codex-compatible control contract and complete, breadth-first app state.
• Adds focused typing, coordinates, multi-click, drag, text selection, secondary actions, and large-chat composer discovery.
• Removes the redundant “Continuing after tool result” rows from expandable work traces, including older saved tasks.
• Keeps successful browser navigation alive when a later BetterWright step fails, returns the real error to the agent for retry, and avoids a fatal alert.
• Restores BetterWright's branded live-view bar and adds an animated orange agent cursor that follows human-style browser clicks and typing.

Assets

• Cos-1.0.2.dmg — drag-and-drop app image for Apple silicon.
• Cos-1.0.2-macOS-arm64.zip — updater-compatible app archive.
• Cos-Source.zip — source snapshot for this tag.
• SHA256SUMS.txt — release checksums.

Cos 1.0.1

Cos 1.0.1

Cos 1.0.1 adds a browser you can watch and tightens the native agent workflow.

Highlights

• Built-in BetterWright 1.6.3 agentic browser with a pinned portable Node runtime.
• Native right-side Browser inspector, opened from the task header or with Shift–Command–B.
• Loopback-only interactive live view attached to the exact task session used by Cos browser tools, with tab switching and a native close-tab action.
• One-time managed browser installation; no Chromium or BetterWright process is kept alive at app idle.
• Ordered steering that interrupts the active provider turn and continues inside the same Cos harness run.
• Model-selectable, effort-aware subagents that still use the provider-neutral Cos harness.
• Provider marks in the model picker, a full reasoning range for GPT-5.6 Luna, and a stable effort slider whose thumb brightens into a sun at higher effort.
• Model-aware reasoning and Fast Mode controls, provider session status improvements, slash references, marketplace management, update controls, and UI polish from the 1.0 stabilization cycle.

Security and packaging

• Browser downloads remain unavailable to models without a separate explicit approval capability.
• Live-view capability tokens remain local to the native view controller and are never added to model context.
• Release packaging verifies pinned Node.js and BetterWright archive checksums and includes third-party license notices.
• This community build remains ad-hoc signed and is not Apple-notarized.

Assets

• Cos-1.0.1.dmg — drag-and-drop app image for Apple silicon.
• Cos-1.0.1-macOS-arm64.zip — updater-compatible app archive.
• Cos-Source.zip — source snapshot for this tag.
• SHA256SUMS.txt — release checksums.

Cos 1.0.0

Cos 1.0.0

Cos 1.0 is the first public open-source release of the native macOS app and Cos harness.

Highlights

• One native provider-neutral harness for every supported model.
• Persistent /goal state, bounded token budgets, and context compaction.
• Direct provider streaming with model-specific reasoning effort and Fast Mode controls.
• Native SwiftUI chat, sidebar, settings, work traces, True Dark mode, and quiet updates.
• Built-in Computer Use with macOS Accessibility setup and intent-scoped execution.
• In-app plugin marketplace, portable skill import, and guarded Cos self-management.
• Verified update downloads with SHA-256, bundle identity, version, and structural signature checks.
• Secure BYOK storage through device-only macOS Keychain items.

Downloads

• Cos-1.0.0.dmg — drag-and-drop app image for Apple silicon.
• Cos-1.0.0-macOS-arm64.zip — updater-compatible app archive.
• Cos-Source.zip — source snapshot.
• SHA256SUMS.txt — checksums for release artifacts.

Signing note

This community build is ad-hoc signed and structurally verified, but it is not Developer ID signed or Apple-notarized. macOS may require System Settings → Privacy & Security → Open Anyway on first launch. Review the repository before granting Full Access or Accessibility permission.

Requirements

• Apple silicon Mac
• macOS 15 or later