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tier-injection

Skill2 starsChanged 7 days agoMITView on GitHub

Installs the tier kit so a subagent runs on the model its tier names. Use when a host must pin the model of a spawn or a subagent ignores its tier.

1 other project uses a version of this.

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  1. Very specific:

    Use low only for work whose wrong answer a check catches and a rerun fixes cheaply.

    line 54

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SKILL.md
<!-- Generated by `basicly skills-build` from skill.yaml. Do not edit; edit the source. -->

Tier Injection

A subagent definition declares a portable tier: low, medium, high or maximum. The kit changes that tier into the model the spawn runs on, at spawn time.

Rules

  • Check CLAUDE_CODE_SUBAGENT_MODEL first when a spawn ignores its tier. It outranks the value the hook writes, and the hook stays silent.
  • Relaunch the whole CLI process after a first install. The host does not watch a directory that did not exist at startup. /clear reloads neither hooks nor agents.
  • Remove a model pin to let the tier decide. The hook leaves a definition that pins its own model, and a spawn that names one.
  • Commit .basicly/core/models/model-map.json in the repository. A repository with no map in its own tree gets no rewrite.

What the kit is

The kit is three files in .basicly/core/kit/tier/: install_hook.py, claude_tier_hook.py and tier_resolver.py. It needs no basicly import, nothing on PATH, no third-party package and no network. Copy the three files and .basicly/core/models/model-map.json into any repository, and the kit works there.

HostResult
Claude CodeA PreToolUse hook on the Agent tool
Copilot CLINothing. Copilot selects the model of a subagent in its configuration, and the kit does not write that configuration

Install

python3 .basicly/core/kit/tier/install_hook.py --dry-run
python3 .basicly/core/kit/tier/install_hook.py
python3 .basicly/core/kit/tier/install_hook.py --user

A second run changes nothing. For every flag (--user, --host, --root, --interpreter, --uninstall) and the command each scope writes, read install.

Check a resolution without a spawn

python3 .basicly/core/kit/tier/tier_resolver.py --host claude --name my-agent

It exits 0 with a model and an alias, or exits 1 with the reason that nothing resolved. Other options: --definition <path>, --tier <tier>, --default-tier <tier>, --vendor <vendor>, --map <path> and --root <path>.

Behaviour to expect

  • The hook writes an alias such as opus, not a model id. The model field of the Agent tool takes an alias. The frontmatter of a definition takes a full model id.
  • A tier that the map marks unavailable resolves to nothing, never to the model of another tier.

When the repository requires tier-only dispatch

  • A dispatch declares a tier: low, medium, high or maximum. It never names a provider model id; the tier kit's model map resolves the tier.
  • Choose the tier by the cost per landed correct change: tokens, time and human interventions. A weak model's mistakes return as rework on the same change.
  • Use low only for work whose wrong answer a check catches and a rerun fixes cheaply. Start implementation from prose, decomposition, design and costly judgements at high.
  • A dispatch with no tier is a bug. It inherits the session's own model.

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