pm-dispatch SKILL: M-grade cards default to the subagent backend with per-dispatch model tiering — cloud reserved for L/XL, long-lived, browser-verify (maintainer ruling 2026-08-12)

[os-zhuang]

Filed by the skills seat (session session_012Gg6rMAti8ZaueWb6BRsDn), 2026-08-12, executing a maintainer ruling from the seat 专题 chat.

Provenance (maintainer, verbatim, untranslated)

还有我发现 agent 派出的云卡片总是忘了归档,派的太多也确实麻烦,我想讨论中级的卡片是不是应该改成子 agent,但是我需要先确认一个事情,子agent 可以指定模型吗?比如 项目经理用 Fable / OPus,子agent可以让项目经理根据难度指定 sonnet opus 或 fable 吗

同意你的建议,刚才几个卡片可以合并开发。

The factual precondition was confirmed before the ruling: the Agent tool takes a per-dispatch model parameter (sonnet / opus / haiku / fable) that overrides the agent definition's frontmatter pin; resolution order is env CLAUDE_CODE_SUBAGENT_MODEL → per-call param → frontmatter → inherit.

The revision (supersedes the 2026-08-10 「M 及以上默认云卡」 default)

• S mechanical + M ⇒ mode:subagent (the PM's own container), with per-dispatch model tiering: S-mechanical sonnet, M opus, judgment-heavy fable; the mandatory claude-fable-5 clause for cards editing .claude/skills/pm-dispatch/** is unchanged and unaffected by size.
• Cloud (mode:cloud) reserved for: L/XL cards; work that must outlive the PM session; browser/dogfood verification; and build-heavy M cards by explicit judgment (the shared-container contention that motivated the old default — docs/instruction M cards never hit it).
• Rationale on record: cloud's three fixed taxes (archival debt — measured up to 11 forgotten containers on one seat; the create_session/poke/subscribe/collect plumbing; per-card container+clone startup) vs the subagent's one real cost (dies with the PM session — mitigated by the measured branch-early + report-at-draft-PR contract, SendMessage transcript revival, and the worktree handoff protocol).
• Consequence: the archive duty applies only to cloud cards, shrinking the forgotten-container surface to L-grade dispatches.

Landing notes

• Edits the backend/sizing section of .claude/skills/pm-dispatch/SKILL.md; ⚠️ ratchet headroom 0 — additions offset in-PR.
• Model tiering mandatory clause: dispatch with model: claude-fable-5.
• ADR-class: draft PR, human merge.

[os-zhuang]

Batch conversion + claim — this card is the carrier of a consolidated dispatch (maintainer: 「刚才几个卡片可以合并开发」, 2026-08-12).

Composition — ONE os-dev subagent (mode:subagent, model: claude-fable-5 — this batch is itself the first run under the backend revision this card lands), two PRs:

• PR₁ (claude/issue-7944-pm-skill-backend-and-reads): SKILL.md — this card's backend/tiering revision + pm-dispatch SKILL: seat-post reads cover only comments newer than the last body edit (token-waste fix, maintainer-approved) #7942's seat-post comment-read boundary. Fixes #7944, Fixes #7942. Ratchet headroom 0 — offsets in-PR.
• PR₂ (claude/issue-7943-agents-principles): AGENTS.md principles-only rewrite per AGENTS.md principles-only rewrite — the largest remaining per-dev-session text cost (maintainer-approved) #7943 (its cautions binding: human-readable, 「AGENTS.md wins」 preserved, CLAUDE.md mirror consistent, ID-lint extended with an order-independence waiver if needed). Fixes #7943.

Claim: PM loop round 4 (skills seat)
Session: session_012Gg6rMAti8ZaueWb6BRsDn
Branch: the two branches above, both off origin/main (≥ 8d80e12, post-#7938)
Worktree: dedicated worktrees inside the PM session's container (subagent backend)
Domain: domain:skills
File surface: .claude/skills/pm-dispatch/SKILL.md + references/seat-post-protocol.md (PR₁); AGENTS.md + CLAUDE.md mirror + scripts/pm/check-skill-id-lint.mjs scan-set (PR₂). Stop on breach; explain in the report.
Container & model: docs-only M batch, mode:subagent (per the ruling this batch implements), model: claude-fable-5 (mandatory clause)
Serial constraints cleared: SKILL.md hot-file queue empty (principles-only batch fully landed — PR #7936 ab19075, PR #7938 8d80e12); zero open PRs touch SKILL.md, AGENTS.md, or os-dev.md (checked at claim time). Members #7942 / #7943 are not independent candidates (membership noted on each).
Both PRs ADR-class: draft, human merge.

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[os-zhuang]

Dispatched (PM loop round 4, skills seat): os-dev subagent, model: claude-fable-5, launched 2026-08-12 ~07:5xZ inside the PM session's container — the first dispatch under the backend revision this very batch lands (subagent for docs-M work; per-dispatch model param confirmed working). Two draft PRs expected per the composition above. Collection: os-dev-report comment here + the subagent's direct return channel; ADR-class terminal (human merge) on both.

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