Service Registry

What it does

When your agent uses it

• Integrating multiple external services needing coordination

Example prompts

• “Use the service-registry skill to register external services with health checks, central config, and unified execution”
• “/service-registry”

Requirements

• Python 3
• A credential in GEMINI_API_KEY

What it can do on your machine

Read from SKILL.md and the folder at commit 9f3eb00. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are python and yaml).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names these keys or tokens, usually read from environment variables:

  • GEMINI_API_KEY

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Service Registry loads about 1k tokens when it runs. Until then it costs about 43 tokens; SKILL.md has 183 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~43

When it runs · the whole SKILL.md, loaded when a task matches

~1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from athola/claude-night-market at commit 9f3eb00, republished under its MIT licence (© athola). 183 words, ~1,024 tokens.

name

service-registry

description

Registers external services with health checks, central config, and unified execution. Use when integrating multiple external services needing coordination.

alwaysApply

false

category

infrastructure

tags

services, registry, execution, health-checks, integration

dependencies

quota-management, usage-logging

provides.infrastructure

service-registry, health-monitoring, execution-engine

provides.patterns

service-discovery, unified-execution, configuration-management

usage_patterns

multi-service-integration, service-health-checks, unified-execution, configuration-management

complexity

intermediate

model_hint

standard

estimated_tokens

550

@dataclass
class ServiceConfig:
    name: str
    command: str
    auth_method: str  # "api_key", "oauth", "token"
    auth_env_var: str
    quota_limits: dict
    models: list[str] = field(default_factory=list)

@dataclass
class ExecutionResult:
    success: bool
    stdout: str
    stderr: str
    exit_code: int
    duration: float
    tokens_used: int

from leyline.service_registry import ServiceRegistry

registry = ServiceRegistry()

registry.register(
    "gemini",
    ServiceConfig(
        name="gemini",
        command="gemini",
        auth_method="api_key",
        auth_env_var="GEMINI_API_KEY",
        quota_limits={"rpm": 60, "daily": 1000},
    ),
)

result = registry.execute(
    service="gemini",
    prompt="Analyze this code",
    files=["src/main.py"],
    model="gemini-3-pro",
)

if result.success:
    print(result.stdout)

# Check single service
status = registry.health_check("gemini")

# Check all services
all_status = registry.health_check_all()
for service, healthy in all_status.items():
    print(f"{service}: {'OK' if healthy else 'FAILED'}")

# Select best service for task
service = registry.select_service(
    requirements={"large_context": True, "fast_response": False}
)

def execute_with_failover(prompt: str, files: list) -> ExecutionResult:
    for service in registry.get_healthy_services():
        result = registry.execute(service, prompt, files)
        if result.success:
            return result
    raise AllServicesFailedError()

# In your skill's frontmatter
dependencies: [leyline:service-registry]

© athola, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 2 other files in plugins/leyline/skills/service-registry of athola/claude-night-market.

• SKILL.md
• modules/execution-patterns.md
• modules/service-config.md

Open the folder on GitHubat commit 9f3eb00