[JacobStephens2]

Summary

Spec #432 adds Antigravity CLI (agy), Grok Build (grok), Muse Code (muse) and OpenCode (opencode) alongside Claude Code and Codex. The command line, User config and installed-only Setup select all six; a Command keeps its Harness, Model and Effort through child Runs, Base fixes, Repairs and Resumes.

Command / User config / Setup
  Harness adapter
    Model and Effort check
    instruction fallback + Factory skills
    unattended session / Resume
    stream progress + final message + usage + outcome
    whole-process-tree stop

• Each Harness owns its protocol in one adapter. Model and Effort checks use agy/Grok catalogs, Muse's cache or minimal call, and an OpenCode standalone call. Setup proposes Muse's non-contributor Model and no OpenCode Model.
• Sessions and Resumes use fixed unattended flags, trust and self-update overrides from ADR 0013. Factory skills use the CLI's prompt style; Muse/OpenCode warn in progress and the Command log when the required skill was not loaded. agy/OpenCode receive excluded instruction-file fallback links where needed.
• Each stream supplies progress, session id, failure and final text, with the full stream retained in its Session log. Muse's session log recovers the last reply and usage; OpenCode's export recovers text, usage and outcome, including failed outcomes with exit 0. Missing/unreadable reads retain stream fallbacks. Logs, PRs and Run notifications identify the Harness, Model and Effort.
• Whole-process-tree interruption covers all six Harnesses, escaped process groups and commands started during the grace period. Whole-Spec review also fixed interruption during Muse checks and OpenCode exports, kept pipe draining interruptible after CLI exit, added Grok error progress, shared fake-CLI helpers and corrected the prerequisites.

Closes #432

Evidence

• Before: interrupting_a_muse_check_stops_its_whole_process_tree_before_work, interrupting_an_opencode_export_stops_its_whole_process_tree, and interrupting_a_muse_check_after_cli_exit_stops_the_command_holding_its_stream each failed: interruption waited over nine seconds for the command.
  After: each regression passes; the Command exits promptly, its recorded child is stopped, and interrupted checks make no Claim or worktree.
• Before: error_events_are_condensed_to_progress_with_groks_failure_text failed with [] instead of error: backend unavailable.
  After: standalone error frames and failed result frames emit error progress while retaining Grok's failure text.
• Final Linux validation: cargo fmt --check; cargo clippy --all-targets -- -D warnings; cargo test (1,170 passed, 0 failed); all four red/green regressions pass. Scenario tests use recorded CLI protocols with fake CLIs; no live paid model calls.
• Final focused rerun: cargo test --test process_tree --test muse_sessions --test opencode_sessions (34 passed, 0 failed).

Seams under test

• A real thirdshift Command against fake CLIs on PATH: configuration, Setup, session flags/environment/stdin, skills/instruction links, Resume, logs, PRs, Architecture review outcomes, failures and interruption of escaped commands, including Muse's Model check, output draining after CLI exit and OpenCode's standalone export.
• Pure parsing of recorded CLI streams, catalogs, Muse session logs and OpenCode exports, including Grok error progress.

Unaddressed findings

Standards

• Test-only compatibility methods and re-exports retain the old argument/prompt test interface. Kept because Spec story 51 and Ticket 1's testing decision explicitly require the existing Claude/Codex tests to pass unchanged; scenario coverage exercises the production adapter interface.

Spec

None. All four initial Spec findings and the follow-up pipe-draining interruption finding were addressed.

Merge Danger

Door: two-way

Code and configuration additions can be reverted; no data migration.

Blast Radius: sessions

Harness choice, Setup, session launch/recovery and interruption affect all six Harnesses. Unattended permissions and trust follow ADR 0013.

Built with codex · gpt-6.1-sol · xhigh

Tickets

• Gather each Harness into one adapter #434 landed with Gather Claude and Codex into Harness adapters #441
• Stop the whole process tree for every Harness #435 landed with Stop every Harness session process tree on interruption #443
• Add the agy Harness (Antigravity CLI) #436 landed with Add the agy Harness (Antigravity CLI) #445
• Add the grok Harness (Grok Build) #437 landed with Add the Grok Build Harness #446
• Add the muse Harness (Muse Code) #438 landed with Add Muse Code Harness #444
• Add the opencode Harness (OpenCode) #439 landed with Add the OpenCode Harness #447