repo-mailbox/skills/route/SKILL.md

name	description	version
route	Decide which model and reasoning effort the NEXT session should run with, by scoring four traits of the next task and running them through the rubric row table (`route.sh`). Use at session end, whenever STATE.md's next step is written or rewritten, and whenever the operator asks what to launch the next session with: "what model should I use next", "which effort level", "close the session", "wrap up", "update STATE", "what should the next session run with", "is opus overkill here", "give me the startup command". Also triggers on Norwegian phrasings: "hvilken modell neste økt", "hvilken effort", "avslutt sesjonen", "oppdater STATE", "hva skal neste økt kjøre med", "er opus overkill", "gi meg oppstartskommandoen", "modell og effort". Trigger even when the operator names no model and no tool — choosing the model for the next session IS this skill. Not for choosing which REPO gets the next session: that is the `board` skill.	0.27.0

route — what the next session should run with

The operator's closing line requires two things every single session: the model and effort for the next session, and a pasteable startup command. This skill produces both from evidence instead of from a hunch, and leaves the scoring behind in STATE.md so a wrong call can be found later.

The division of labour is the whole design. Scoring the four traits is judgement and belongs to you. Turning scores into a model is a lookup, and route.sh does it deterministically — same scores, same answer, every time, at zero token cost. Never "reason your way" to a model. If you find yourself weighing whether the task feels hard enough for Opus, you have skipped the scoring step and are doing the thing this skill replaces.

The engine

ROUTE="${CLAUDE_PLUGIN_ROOT}/scripts/route.sh"

"$ROUTE" --path <known|partial|undetermined> \
         --verification <strong|weak|none> \
         --reversibility <cheap|costly|one-way> \
         --scope <local|multi-file|cross-cutting> \
         --rationale "why these four scores" \
         [--last-model <name> --last-effort <level> \
          --last-completed <yes|no> --last-corrections <n>]

There is no deployed copy anywhere else and no fallback path — one entry point is deliberate. Exit 2 means a bad or missing argument; read stderr and fix the call rather than dropping the flag. route.sh --help carries the full row table and the reasoning behind it.

The script writes nothing. It prints row, rule, next-cost, command, fallback, fallback-command, route-line and (when the record is given) route-last. You paste those into STATE.md.

Scoring the four traits

Score the task the NEXT session will do — the one in the 👉 NESTE block — not the one that just finished. Read the next step as written before scoring; if you cannot score it from what is written, that is a finding (see below).

Trait	Score it by asking
path	Is the solution route already described? known = the steps are written down or the pattern exists in this repo. partial = the shape is clear, one real decision is open. undetermined = it has to be found first.
verification	Will a machine catch the error? strong = tests, types or a compiler fail on it. weak = a smoke test or manual run would probably surface it. none = prose, API shape, a security judgement — a wrong answer just sits there.
reversibility	cheap = a commit away. costly = touches published state, needs a migration or a follow-up release. one-way = a pushed tag, a public interface, a deletion.
scope	local = one file or one function. multi-file = several files, one repo. cross-cutting = many subsystems, or more than one repo.

verification carries the most signal and is the trait most often skipped. Strong verification means a cheap model's mistakes get caught and corrected — cheap model plus tight feedback beats an expensive model without it. When nothing verifies the output, model quality is the only defence left.

Three rules that keep the scoring honest:

• Score the task, never the feeling. "Hard", "complex" and "important" are not traits here. They are unfalsifiable, and they always resolve upward.
• --rationale is required and is the point. It is where a misscore is caught weeks later, when the recommendation turns out to have been wrong. One sentence naming the evidence: "the pattern exists in handlers/, but the error handling is undecided" — not "medium difficulty".
• When torn between two scores, take the more expensive one. Escalation is asymmetric by design: any one trait escalates, and row 1 needs all four at the cheap end.

The specification check you get for free

If the next step is scored path=undetermined and no design phase is planned, the task description is underspecified — the model is not too small. Say so, and rewrite the next step until it can be scored. Upgrading the model to compensate for a vague specification is the most expensive form of procrastination available, and it hides the real defect.

This check is worth more than the tokens the routing saves. Do not skip it by scoring partial to keep things moving.

Fable rows are never this calculator's output

route.sh only ever emits rows 1-4. Rows 5-6 (Fable) fired from an explicit --opus-xhigh-failed flag until 2026-08-06, when the operator removed that policy; nothing replaced it as a trait-derived outcome. Choosing Fable is now always a deliberate deviation from the rubric — CLAUDE.md is explicit that the rubric stays the only deterministic lookup and a departure from it is recorded in STATE as an override, never as something this skill produces. If Fable is the right call for the next step's form (big-picture, review, planning), write the board line and the rule by hand — board.sh still parses "Fable 5/high" and "Fable 5/xhigh" — and say so plainly in the rationale rather than scoring the four traits to land there. One fact worth carrying into that override: a Fable session runs without an advisor.

The last-session record

Write it whenever all four fields are actually known, from what happened in the session that is ending — never from what STATE.md prescribed:

• --last-model / --last-effort — what this session actually ran with. Both are closed sets (Sonnet 5|Opus 5|Fable 5, and the verified effort levels), because the next session compares these values rather than just displaying them.
• --last-completed yes|no — did this session finish the next step the previous STATE.md set out? Answer about that step, not about the session in general.
• --last-corrections <n> — how many rounds of rework it took. This is the cheap proxy for whether the routing was right.

Measure the effort, never infer it. Read what this session actually resolved:

echo "$CLAUDE_EFFORT"

CLAUDE_EFFORT is Claude Code's own current effort level, exported into every tool-use context — which is why a Bash call can read it. Pass it verbatim as --last-effort. The model is not in the environment (there is no CLAUDE_MODEL); take it from what this session knows itself to be running as.

Two sources are wrong on purpose, and both fail the same way. The previous board line holds what was prescribed, not what was run — the two come apart exactly when the record would be most interesting. Asking the operator launders that same prescription through a human, who is reading it off the startup command they typed rather than off the running process. Confirming a measured value with them is fine; sourcing it from them is not.

So the record no longer waits on anyone: all four fields are knowable from inside the session that is ending. Still omit it entirely — all four or none — if any one of them is genuinely unknown. A guessed value is worse than a missing one, because it reads back later as a measurement.

This file must never declare an effort: frontmatter field. Skill frontmatter overrides the session effort while the skill is active, so the reading above would report this skill's effort instead of the session's — a measurement measuring itself, with nothing in the output to show it happened. Pinned by route-selftest.sh section 13.

One honest limit: CLAUDE_EFFORT is the current level, so if the operator changed it mid-session with /effort, "the effort this session ran with" is not a single value. Record the level the work was actually done at and say so.

Writing it into STATE.md

Three single-line HTML comments sit directly under the 👉 NESTE heading, in this order:

<!-- board: status=in-progress; blocked-on=-; next-cost=Opus 5/high -->
<!-- route: path=partial; verification=strong; ...; rationale=... -->
<!-- route-last: model=Opus 5; effort=xhigh; completed=yes; corrections=1 -->

Splice the emitted next-cost value into the existing board line — leave status and blocked-on alone, they answer a different question and this skill knows nothing about them.

They must stay single-line comments. board.sh reads the first line under the heading that is not blank, not a heading, and does not start with <!--, and shows it as that repo's next step across every repo. A YAML block or a comment broken across lines therefore replaces the repo's next step on the board with next_task:. Measured, not assumed — route-selftest.sh section 7 pins it.

Reporting it

Give the operator the two closing-line items and nothing more:

• Modell neste økt: the next-cost value, plus the fallback one row cheaper for quota pressure. Name the rule that fired — "path=partial" — so the call is auditable rather than asserted.
• Oppstartskommando: the command string, in its own code block, with /exit named. Never prefix it with cd: one repo per terminal tab, so the working directory is already right. If the next step belongs in a different repo, say so in plain words — that is a different tab, not a cd.

Paste command verbatim, --advisor opus included. The calculator decides the advisor per row, and it is not decoration: on a Sonnet row it is what lifts the session to Opus judgement at Sonnet cost, which is what makes the cheaper fallback-command safe to take under quota pressure. Dropping it because it looks like noise silently removes that. Equally, never add it to a command that came back without one — an unconditional advisor is the global advisorModel setting, which costs quota in every session in every repo and is the failure mode this rule replaces. route.sh --help carries the full rule.

If command and fallback-command are the same as the current session's model, say /clear is enough instead — but only if no newly installed plugin or skill needs a fresh process to be picked up.

--advisor is part of that comparison, not an afterthought. It is a launch flag, so /clear reuses the process and keeps whatever advisor the session started with. If command carries --advisor opus and this session was not launched with it, /clear is not enough — the operator needs /exit and the full command, or the advisor silently never appears.

Do not paste the whole output block. One row, the rule that produced it, the command.