Agent reference

The seats this harness can install. A run installs between 3 and 17 of them, decided by the contract and by what the codebase analysis found, plus one dev-agent per module that actually exists. Never all of them by default: see Tailored Build.

Every seat carries an explicit model and effort. An unset model means inherit, which silently bills mechanical work at the caller's tier, so the harness never leaves it unset.

Seat	Model	Effort	maxTurns	Installed	What it is for
ba-analyst	sonnet	high	40	needs purpose_code	Writes and edits the specification set in docs/specs/ and the PRDs in docs/requirements/.
checker	opus	high	25	needs checker	Read-only check of a finished deliverable before it is relied on - every claim traced to a source that says it, a red-team pass that attacks the reco…
code-reviewer	opus	high	25	needs purpose_code; absent when solo_review	Reviews a branch diff against coding standards and project rules.
data-modeler	sonnet	high	40	needs db	Designs and modifies the the ORM schema and its migrations, per the ERD and the data dictionary.
db-engineer	sonnet	medium	40	needs db and db_engineer	Database operations - applies and troubleshoots migrations, tunes queries and indexes, checks integrity, manages the local DB environment.
db-seeder	haiku	low	15	needs db and db_seeder	Seeds the local or dev database with deterministic synthetic data.
debugger	opus	xhigh	30	needs purpose_code	Root-cause diagnosis of failing CI jobs, failing tests, runtime errors, and environment problems.
devops	sonnet	medium	40	needs purpose_code	CI/CD (CI), environments, infrastructure, and gated releases to the hosting target.
history-tracker	haiku	low	10	needs audit or long	Inspects and summarizes the agent-run archive in .claude/state/history/ (written automatically by the agent-history hook).
merge-manager	opus	medium	20	needs merge_gate	Merges approved pull requests into the default branch and resolves merge conflicts under delegated authority.
orchestrator	opus	high	60	always	Mission controller for Guarded work - plans and decomposes a request that needs two or more seats in a dependent order, or touches schema, auth, mone…
qa-test	sonnet	medium	40	needs tests	Writes and runs the automated tests (unit: the unit framework, e2e: the e2e framework) that prove the stated acceptance criteria.
researcher	sonnet	medium	40	needs long or purpose_research or purpose_strategy	Answers a stated question with cited evidence - gathers sources, records findings with their provenance, and writes the synthesis under docs/.
reviewer	opus	high	25	needs solo_review	The merged review gate for small projects - one read-only pass over a branch diff covering both code quality and security.
security-reviewer	opus	high	25	needs purpose_code; absent when solo_review	Reviews a branch diff for security and privacy - secrets, PII, authn/authz, input validation, injection, dependency risk.
spec-guardian	sonnet	medium	15	needs purpose_code	Checks a feature or change against the written requirements - FR/NFR, acceptance criteria, business rules.
strategist	opus	high	30	needs long or purpose_strategy	Frames an open decision, lays out genuinely distinct options, scores a trade-off matrix and writes the recommendation as a decision memo or an ADR dr…
writer	sonnet	medium	40	needs purpose_docs	Writes and edits this repository's documentation - new pages, restructures, corrections, style passes - from a stated source of truth.

Reviewers hold no write tools

code-reviewer and security-reviewer (or the merged reviewer under the solo_review flag) have no Edit and no Write. Not "usually" - none. A reviewer that can edit is not a review gate.

The template seat

dev-agent.md is not in the table because it is a template, instantiated once per module with that module's real paths as its scope. A module with no seat, or a seat with no module, is a finding in harness-view assess.