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subagent: tell agents they can liberally spawn haiku, even at high effort

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damocles 2026-10-05 01:56:34 +02:00 • committed by mara
commit 2ca2c6c42e
2 changed files with 31 additions and 7 deletions
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26
claude-plugins/plugins/base/skills/claude-subagents/SKILL.md
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@ -52,13 +52,33 @@ Model choice, prompt hygiene, splitting big batches, verify-then-report —
everything else in this skill — applies exactly the same whether you're
calling the tool or thinking through the recipe by hand.
## Model choice
Pick the cheapest model that can do the job, and lean toward the cheap end
more readily than you might for your own work — a subagent is throwaway
compute, not a peer you're rationing. Haiku in particular is cheap enough
that you don't need to be precious about spinning one up: for a mechanical,
well-scoped batch (the shape this skill is for), reach for it liberally
rather than defaulting to a bigger model "to be safe." Haiku also stays
cheap even at `effort: high` — unlike a frontier model, where effort and
cost scale together, so there's no need to cap Haiku's effort the way the
Effort section below recommends for cost reasons; raise it freely if the
task benefits from the extra reasoning.
This isn't "always pick the smallest model regardless of task" — a batch
that actually needs judgement calls still wants a stronger model (see
Pitfalls below). It's "don't under-use Haiku out of habit-driven caution
when the task is mechanical enough for the skill to apply at all."
## Effort
An omitted `effort` defaults to `medium` here — cheaper than claude's own
model default (`high` on most models), a deliberate cost-conscious choice
for subagent work specifically, same spirit as "cheaper-than-you" model
choice above. Raise it explicitly when the task is complex enough to
actually need deeper reasoning, not as a reflex.
for subagent work specifically, same spirit as the model-choice guidance
above. Raise it explicitly when the task is complex enough to actually
need deeper reasoning, not as a reflex. **Exception: on Haiku, cost doesn't
scale with effort the way it does on a frontier model** — see Model choice
above, don't apply this same-default-medium caution to a Haiku subagent.
Anthropic's own levels (per current Claude Code docs — names/availability
are model-dependent, check before relying on an exact list): `low`,

12
hive-subagent-mcp/src/mcp.rs
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@ -44,9 +44,11 @@ struct StartArgs {
/// session under that name is done — rejected while one under the same
/// name is still running.
name: String,
/// Which model the subagent's own session runs. Omit for claude's own
/// default. The `base:claude-subagents` skill's "cheaper-than-you"
/// guidance still applies here.
/// Which model the subagent's own session runs (`--model`). Omit for
/// claude's own default. The `base:claude-subagents` skill's "Model
/// choice" guidance still applies here — pick the cheapest model that
/// can do the job, and don't be stingy about reaching for Haiku on a
/// well-scoped mechanical batch.
#[serde(default)]
model: Option<String>,
/// Which reasoning effort level the subagent's own session runs at
@ -55,7 +57,9 @@ struct StartArgs {
/// models). Independent of `model`, so a cheap model at high effort or
/// an expensive one at low effort are both valid combinations, not
/// just the two extremes. See the `base:claude-subagents` skill for
/// Anthropic's own guidance on choosing between levels.
/// Anthropic's own guidance on choosing between levels — note that on
/// Haiku specifically, cost doesn't scale with effort the way it does
/// on a frontier model, so there's no cost reason to cap it at `medium`.
#[serde(default)]
effort: Option<String>,
/// Path to a file holding the subagent's actual task instructions. A