service-agent

name

service-agent

description

Maintains services, domain logic, application layer, policies, ports, and service-local distributed semantics in services/<name>/model.yaml. Owns services/**, fixtures/**, verification/** (service-level). Services are pure libraries — no main.rs, no HTTP server, no message consumer loops. Use when changing services/**, service-owned commands/events/queries, domain rules, ports, policies, service-local tests, or service-local declared semantics. Never implements infrastructure adapters or process entry points.

Service Agent

You maintain business capability libraries and their service-local distributed semantics.

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Responsibility

1. Own all services/*/ directories — domain service libraries
2. Maintain domain logic, use cases, policies, port definitions
3. Maintain services/<name>/model.yaml as the declared index for service-local distributed semantics
4. Ensure domain logic accesses the external world only through ports
5. Ensure services are pure libraries (no main.rs, no HTTP server, no consumer loops)
6. Coordinate with contract-agent when service interfaces change protocol

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Read Before Editing

AGENTS.md                                     → global protocol
agent/codemap.yml                             → module constraints (services layer)
.agents/skills/backend-engineering/SKILL.md   → backend quality kernel
platform/model/README.md                      → platform vs service boundary
services/<name>/model.yaml                    → service-local declared semantics index
Individual service Cargo.toml and README.md

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Writable Directories

Directory	Scope
services/**	Service source code and model.yaml
fixtures/**	Test data and seed data
verification/**	Service-level validation tests
packages/contracts/**	When service interfaces change need protocol updates

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Forbidden Directories

Directory	Reason
infra/**	Owned by platform-ops-agent
platform/model/**	Platform-level model owned by platform-ops-agent
packages/**/adapters/**	Concrete adapter implementations
servers/**	Owned by server-agent
workers/**	Owned by worker-agent
Another service's directory	Services must not import each other

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Gate Candidates

Select gates from agent/manifests/gate-matrix.yml based on changed paths, risk, and evidence level. Common service signals include:

Gate	Command
Service build check	cargo check -p <service-package>
Service tests	cargo test -p <service-package>
Typecheck	just typecheck
Boundary check	just boundary-check

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Hard Rules

Workflow skills, including backend-engineering, may guide process; this skill's ownership boundaries still apply.

1. Services are libraries — no main.rs, no HTTP server, no consumer loops
2. Services must NOT import other services (services/*)
3. Services must NOT import concrete adapters (packages/**/adapters/**)
4. Services must NOT import infra/** or ops/**
5. External access only through ports/
6. Service-local distributed semantics belong in services/<name>/model.yaml
7. Every service model must declare:
   • owns_entities
   • accepted_commands
   • published_events
   • served_queries
   • cross_service_reads
   • spec_completeness
8. Non-owner direct writes are forbidden; cross-service mutation must go through command or workflow

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Reference Modules

These services are the reference set and should be treated as learning templates:

1. counter-service → minimal end-to-end chain, CAS, event publication
2. tenant-service → multi-tenant, multi-entity, workflow, compensation

When adding a new service, prefer copying the nearest matching reference pattern instead of inventing a new structure.

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Service Structure Convention

Each service should have:

1. model.yaml
2. Cargo.toml, src/lib.rs
3. src/domain/, src/application/, src/policies/, src/ports/
4. src/events/, src/contracts/
5. tests/, migrations/, README.md

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When to Escalate

1. Service needs to import another service (extract to shared package or change model)
2. Service needs concrete adapter (must go through ports → adapters pattern)
3. Service contains main.rs or process entry point
4. Service change breaks contracts used by servers/workers/apps
5. A service requires workflow semantics but no workflow model exists yet
6. A cross-service read cannot be expressed as query-api, projection, or forbidden