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johsem

Semaphore UI MCP server

by johsem

create_task

Destructive

Starts an automation task in Semaphore UI by submitting a project task request with a template, environment, and Ansible or Terraform parameters.

Instructions

Start an automation task. Ansible and Terraform switches belong in body.params; environment and arguments are JSON-encoded strings. This executes code on managed infrastructure. POST /project/{project_id}/tasks. Supply API fields in body; JSON-encoded string fields must remain strings.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bodyYes
project_idYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.4/5.0
Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already flag destructive=true, idempotent=false and openWorld=true, and the description adds real context beyond them: 'This executes code on managed infrastructure' warns of consequential side effects, and the emphasis that JSON-encoded strings must stay strings heads off a common serialization failure. It does not cover permissions or concurrency limits.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Purpose is front-loaded, followed by parameter placement rules, a safety warning, and the endpoint. It is compact and mostly waste-free, though 'environment and arguments are JSON-encoded strings' and 'JSON-encoded string fields must remain strings' partially restate each other.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given a nested body with ~14 properties at 0% schema coverage, a destructive annotation, and no output schema, the description covers the highest-risk traps but leaves most body fields (secret, message, playbook, version, inventory_id, build_task_id) entirely undocumented. Adequate but with clear gaps for a mutation tool of this complexity.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% on a deeply nested body, but the description supplies genuinely useful placement rules: Ansible/Terraform switches go under body.params, environment and arguments are JSON-encoded strings. It still says nothing about template_id being the sole required body field or what limit, secret, playbook, inventory_id or version mean.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a concrete verb+resource ('Start an automation task') and even gives the underlying REST route (POST /project/{project_id}/tasks), so the operation is unambiguous. It does not, however, distinguish this from nearby siblings such as run_workflow or create_schedule, leaving that differentiation to the name alone.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

There is no statement of when to use this versus run_workflow or wait_for_task, no prerequisites (e.g., a template must exist and template_id is required), and no exclusions. Usage is only implied by the word 'Start'.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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