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CASDA MCP Server

by jbwod

Create CASDA cutout job

casda_create_cutout

Create a cutout of a CASDA data product by specifying spatial and spectral constraints such as circle, polygon, band, or channel.

Instructions

Create one cutout SODA job via the DataLink cutout_service descriptor.

Requires CASDA_ENABLE_STAGING and credentials. Never auto-retries create/start.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
polNoSODA POL constraint.
bandNoSODA BAND constraint in metres (wavelength).
coordNoSODA COORD system, for example ICRS.
circleNoSODA CIRCLE constraint: 'ra_deg dec_deg radius_deg'.
channelNoSODA CHANNEL constraint.
polygonNoSODA POLYGON constraint as space-separated ra/dec pairs.
product_idYesExact CASDA product identifier.
idempotency_keyNoCaller-supplied idempotency key; a UUID is generated when omitted.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
errorNo
reusedNo
statusNo
job_kindNofull_file
productsNo
provenanceNo
request_idNo
submitted_atNo
idempotency_keyNo
human_gate_warningsNo
Behavior4/5

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

Annotations already indicate a write operation (readOnlyHint=false) and non-idempotence (idempotentHint=false). The description adds unique value by stating 'Never auto-retries create/start' and requiring specific environment configuration, disclosing behavioral traits beyond the structured annotations.

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

Conciseness5/5

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

The description is extremely concise at two sentences. The first sentence states the core purpose, the second provides prerequisites and a key behavioral note. No redundant or unnecessary information.

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

Completeness4/5

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

With an output schema present and annotations, the description covers the essential purpose, prerequisites, and a behavioral constraint. It does not explain error handling or the concept of a 'cutout SODA job', but for a well-documented tool with a rich schema, this is sufficient.

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 coverage is 100%, so the input schema fully documents all 8 parameters. The description does not add any parameter-specific details beyond what the schema already provides, so it performs at the baseline for parameter semantics.

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

Purpose5/5

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

The description clearly states 'Create one cutout SODA job via the DataLink cutout_service descriptor', specifying the action (create), resource (cutout SODA job), and method. This distinguishes it from sibling tools like casda_create_spectrum which creates a different type of job.

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

Usage Guidelines4/5

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

The description mentions prerequisites ('Requires CASDA_ENABLE_STAGING and credentials') and a behavioral constraint ('Never auto-retries create/start'), providing clear context for when the tool can be used. However, it does not explicitly compare with alternatives or exclude other tools.

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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