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Fleet Identity, Class, and Runtime

Each roster field has one job. Do not use names or model strings as authority shortcuts.

Concern Field Contract
Stable machine identity agents[].name Unique, immutable mutation target and exact service/session name.
Display identity agents[].alias Human-facing label only; may be changed and grants no authority.
Behavioral contract agents[].class Resolves through the shared baseline plus roles.local persona library.
Tool boundary agents[].tool_policy Must match protected canonical classes; cannot independently grant authority.
Harness agents[].runtime One of claude, codex, opencode, or pi, declared in runtimes.
Backend selection agents[].provider and model Explicit non-empty data; capability validity is not inferred from the display name or class.
Effort agents[].reasoning low, medium, or high.
Local placement working_directory Explicit safe local work path; not remote placement authority.

Tess and Ultron are conventional instance/display names only. They are not products, required machine identities, role aliases, or authority-bearing classes. A configurable interaction instance uses class: interaction; a configurable validation instance uses class: validator. Any stable name and alias satisfying the structural contract may be used.

Class aliases are deliberately narrow: implementer → code, reviewer → review, and operator-interaction → interaction. No runtime, provider, model, persona prose, or instance name changes this mapping. See role classes and the validated generic example.

Roster v2 is local-only. It contains no host/SSH placement, connector, channel, secret-reference, arbitrary-command, per-agent socket, or gateway mapping fields. Those concerns require separate requirements and threat models.