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Accepted in its amended form on 2026-10-19 by owner decision SDLC D11, recorded in 0121.
Amended by 0121: OpenCode runs Kimi K3 for the steward and executor tiers only; reviewers, guardians and the lead never run on OpenCode.

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Context

0017 rule 4 says “Claude only”, and 0011 lists delegating implementation to a cheaper model through another runner as Rejected, with a revival trigger of a measured pass rate on this repository. The owner now wants to delegate mechanical work to OpenCode with Kimi to save cost, accepting a trial. This ADR conflicts with both Accepted pages: once accepted, it changes rule 4 of 0017 and reopens that row of 0011.

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Decision

  1. Claude Code leads and commits. It owns clarify, specs, design, ADRs, cross-service contracts, auth, tenancy, IAM, money and PII work, secrets and CI-permission configuration, final review, pnpm verify, merge, releases, production promotion and incidents.
  2. OpenCode (Kimi) executes routed tasks: tests, stewards (docblocks, standards, i18n, changesets, docs), fixes after a failed verify, Renovate fix-ups, porting Figentra OS packages, low and medium-risk spec tasks, codegen drift, read-only scans, E2E and Maestro runs, Linear bookkeeping.
  3. One git worktree per delegated task, started by tools/scripts/delegate.mjs as opencode run --agent <x> --format json. OpenCode never runs in the main checkout, and never with --auto where it may ask.
  4. .agents/routing.yaml is the matrix: task type to executor and model. An override is a flag or STACKRA_EXECUTOR, and is logged.
  5. Budget: $150 per day, warning at 80%, measured by pnpm ai:spend. delegate.mjs refuses to start a task over the cap, and the SessionStart hook prints the spend.
  6. A guard plugin for OpenCode (ported from the academorix repository) enforces worktree-only writes and the path guards Claude’s hooks apply.
  7. Delegated output is reviewed like any other change and merges only after Claude’s review and a green pnpm verify. Tier-to-model names stay in .agents/models.json.

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Consequences

  • Cost falls on mechanical work; review load on Claude rises. The pass-rate evidence 0011 asks for is collected from the first delegated tasks.
  • A second runner means a second place for guards to be wrong; the plugin port is a prerequisite, not a follow-up.
  • Rule 4 of 0017 and the 0011 row need a superseding edit when this is accepted.

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Enforcement

Planned: tools/scripts/delegate.mjs (worktree-only, budget refusal), a .agents/routing.yaml schema check in agents:lint, and the OpenCode guard plugin. Nothing exists yet.

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Supersedes and sources

Will supersede 0017 (rule 4 only) and change one row of 0011. Sources: owner decision in chat, 2026-10-19 (agents and budget notes).