Model Committee Fable

Model Committee (Fable-chaired)

Run GPT-5.5 and Claude Opus 4.8 as a deliberating committee, with Fable 5 as the chair. Preserve a clear distinction from $model-council-voting: a council measures independent disagreement; this committee deliberately exposes each member to the other's argument and produces one decision.

Read references/protocol.md completely before running a committee.

Chair variant. This is the Fable-chaired member of a three-variant family; all three deliberate the same two members (GPT-5.5 + Opus 4.8) and differ only in which model chairs the synthesis. Fable's value here is a lightweight, fast, procedurally disciplined chair: the heavy reasoning is already spent inside the two members' three rounds, and the chair's remaining job is mostly mechanical, so a lean chair is a deliberate cost choice — and, being neither member, it cannot vote its own prior a third time. Because Fable is a Claude-family model, running under Codex delegates the chair step to it via the bundled claude-member.sh. Siblings: model-committee (Opus 4.8 chairs) and model-committee-sol (GPT-5.6 "Sol" chairs).

Gate the workflow

Run only when the user explicitly invokes $model-committee-fable or requests a Fable-chaired GPT-5.5 / Opus 4.8 deliberation. The workflow makes external model calls and uses more tokens than a single answer.

Apply the use-case gate in the protocol first. If the task does not qualify, recommend the correct alternative and do not call any model.

Before the first call:

1. Confirm the task and the decision that must be returned.
2. Confirm any sensitive material may be sent to both providers.
3. Explain that both CLIs may consume separate plan credits or API spend; obtain confirmation unless already explicit.
4. Precommit the evaluation criteria, weights, and tie rule.

Preflight members and chair

Resolve SKILL_DIR as the directory containing this SKILL.md, then run:

"$SKILL_DIR/scripts/codex-member.sh" --check
"$SKILL_DIR/scripts/claude-member.sh" --check

Default pins:

• GPT member: gpt-5.5
• Claude member: claude-opus-4-8
• Chair: claude-fable-5 (Fable 5), reached through claude-member.sh

These are deliberately exact pins, not moving aliases. Do not silently substitute another model. If a pin is unavailable, report it and ask whether to stop or use a named replacement.

Run the committee

Create a temporary working directory such as .committee-tmp/<slug>/. Follow the protocol's prompt contracts and produce these artifacts:

brief.md
round-1-gpt.prompt.md       round-1-gpt.md
round-1-opus.prompt.md      round-1-opus.md
round-2-gpt.prompt.md       round-2-gpt.md
round-2-opus.prompt.md      round-2-opus.md
round-3-gpt.prompt.md       round-3-gpt.md
round-3-opus.prompt.md      round-3-opus.md
chair.prompt.md             decision.md

Invoke each member through the bundled read-only driver:

"$SKILL_DIR/scripts/codex-member.sh" \
  --prompt-file <prompt.md> --out <output.md> -C <working-directory>

"$SKILL_DIR/scripts/claude-member.sh" \
  --prompt-file <prompt.md> --out <output.md> -C <working-directory>

Launch the two calls in each round concurrently when the runtime supports it. Sequential execution is acceptable only if the second prompt was frozen before the first result arrived. Do not show either member the other's output during round 1.

Chair with Fable, without becoming a third debater

The chair for this variant is Fable 5. Bundle the brief and all round outputs into chair.prompt.md (using the protocol's decision-rule and output contracts), then delegate the post-round-3 chair step:

"$SKILL_DIR/scripts/claude-member.sh" \
  --prompt-file chair.prompt.md --out decision.md --model claude-fable-5 -C <working-directory>

The chair's job:

• validate outputs against the required schemas;
• aggregate the predeclared weighted scores mechanically;
• apply the precommitted tie rule;
• synthesize only components both revisions explicitly mark compatible; and
• never introduce a new substantive option or break a tie by confidence, eloquence, or model identity.

If the evidence remains genuinely unresolved, return the exact fork to the user. A forced but unsupported answer is not committee consensus. Verify the chair's arithmetic against the round-3 score tables and confirm the decision matches the precommitted rule before you deliver it — the mechanical steps are exactly where a lightweight chair must be checked.

Deliver

Return a compact decision record containing:

1. use case and why committee treatment was justified;
2. decision and decision rule (note that Fable 5 chaired);
3. strongest reasons and evidence;
4. what changed during deliberation;
5. surviving dissent or uncertainty;
6. implementation or verification next step.

Delete .committee-tmp/ after delivery unless the user asks to preserve the full transcript. Never let any member or the chair edit the workspace during deliberation; implement only after the decision is accepted.