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Supersedes 0017. Amends and accepts 0066. Amends decision 9 of 0121 (the package steward is folded in).

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Context

0017 (Accepted) named an agent roster with economy, standard and frontier tiers. The owner’s answers B5, B6, B7 and the roster decisions (mem L389–394, 2026-10-20) replace the tiers and fix who merges.

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Decision

  1. Tiers (B6). Five tiers replace economy, standard and frontier: steward, executor, reviewer, guardian and lead.
  2. Models. Opus leads. Fable is used only for ADR and constitution reversals and deep audits. Guardians run on Opus, reviewers and executors on Sonnet, and stewards on Haiku.
  3. Roster.
    • The package steward is folded into the code-standards steward.
    • A code reviewer is added, on Sonnet, escalating to Opus.
    • OpenCode gets only the steward and executor rows, on Kimi K3 (B5).
    • The user-level drizzle, nestjs and expo-router skills move to the Academorix and Figentra repositories.
  4. Merging (B7). Claude commits, pushes and merges through pr:merge, under the merge rule of the register (after a green gate and an independent reviewer PASS). Releases and production promotion stay with a human.
  5. Routing. .agents/routing.yaml is updated, and the stale sdlc:* routes are fixed (gap B11).

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Consequences

  • A tier names what the agent does, not what it costs.
  • Fable’s cost is limited to reversals and audits, so routine work does not use it.

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Enforcement

planned — pnpm validate checks models.yaml and routing.yaml against the roster; pnpm agents:check checks the projections.

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Open questions

  1. None for the roster. The OpenCode row depends on the Kimi K3 availability.

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Alternatives

  • Economy, standard and frontier tiers: superseded by B6.

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Supersedes and sources

Supersedes: 0017. Amends and accepts: 0066; amends decision 9 of 0121. Sources: owner answers B5, B6, B7 and the roster (stackra-decisions-2026-10-19.md L389–394, 2026-10-20). Closes gap B5–B7 and B11.