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by fit.caliper
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PLY Analysis

format_ply
Read-onlyIdempotent

Extract metadata from a PLY file (ASCII or binary).

Returns vertex/face counts, element properties, feature detection
(normals, colors, texcoords, intensity, curvature), bounding box,
centroid, and point cloud identification.

Payment via x402 (USDC on Base) or card via MPP (Stripe). See format_auto
for payment flow details. Privacy policy: https://caliper.fit/privacy

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
paymentNoPayment proof as a JSON string. Set this when retrying after a payment_required response. For x402: must contain 'transaction' (on-chain tx hash), 'network', and 'priceToken' from the payment_required response. For MPP: must contain 'challenge' and 'payload' from the org.paymentauth/credential flow. Default: null (omit on first call; set only when retrying with payment).
file_b64NoBase64-encoded file content. Max 200KB decoded. Use file_url for larger files to avoid consuming model context window budget. Default: null (omit if providing file_url instead).
file_urlNoHTTP/HTTPS URL of the geometry file to analyze. Preferred for large files (over 200KB). The file format is detected from the URL path extension, so the filename parameter is not needed when using file_url. Max 100MB. Default: null (omit if providing file_b64 instead).
filenameNoOriginal filename with extension (e.g. 'model.stl'). Required for format detection when using file_b64. Not needed when using file_url (format is detected from the URL path). Default: null.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedInput schema / properties / payment / description
      Previous value: -"x402 payment proof as a JSON string. Set this when retrying after a payment_required response. Must contain 'transaction' (on-chain tx hash), 'network', and 'priceToken' copied from the payment_required response. Example: {\"transaction\": \"0xabc...\", \"network\": \"base\", \"priceToken\": \"4:1776026505:1fe9...\"}. Default: null (omit on first call; set only when retrying with payment)."New value: +"Payment proof as a JSON string. Set this when retrying after a payment_required response. For x402: must contain 'transaction' (on-chain tx hash), 'network', and 'priceToken' from the payment_required response. For MPP: must contain 'challenge' and 'payload' from the org.paymentauth/credential flow. Default: null (omit on first call; set only when retrying with payment)."
  2. Changed4 schema fields changed
    • changedInput schema / properties / file_b64 / description
      Previous value: -"Base64-encoded file content. Use for files under 200 KB."New value: +"Base64-encoded file content. Max 200KB decoded. Use file_url for larger files to avoid consuming model context window budget. Default: null (omit if providing file_url instead)."
    • changedInput schema / properties / file_url / description
      Previous value: -"HTTP/HTTPS URL of the geometry file to analyze. Preferred for large files."New value: +"HTTP/HTTPS URL of the geometry file to analyze. Preferred for large files (over 200KB). The file format is detected from the URL path extension, so the filename parameter is not needed when using file_url. Max 100MB. Default: null (omit if providing file_b64 instead)."
    • changedInput schema / properties / filename / description
      Previous value: -"Original filename with extension, used for format detection when providing file_b64."New value: +"Original filename with extension (e.g. 'model.stl'). Required for format detection when using file_b64. Not needed when using file_url (format is detected from the URL path). Default: null."
    • changedInput schema / properties / payment / description
      Previous value: -"x402 payment proof as a JSON string. Set this when retrying after a payment_required response. Must contain 'transaction' (on-chain tx hash), 'network', and 'priceToken' from the payment_required details."New value: +"x402 payment proof as a JSON string. Set this when retrying after a payment_required response. Must contain 'transaction' (on-chain tx hash), 'network', and 'priceToken' copied from the payment_required response. Example: {\"transaction\": \"0xabc...\", \"network\": \"base\", \"priceToken\": \"4:1776026505:1fe9...\"}. Default: null (omit on first call; set only when retrying with payment)."
  3. Added

TDQS

A4.3/5.0
Behavior4/5

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

Annotations already provide readOnlyHint, openWorldHint, and idempotentHint, so the safety profile is known. The description adds value by detailing the exact metadata returned, the supported file formats, and the payment requirement (x402 or MPP), which are not inferable from annotations alone.

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 appropriately concise and front-loaded: it opens with the core purpose, then lists return values, and finally payment/privacy info. Every sentence contributes necessary information without redundancy.

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

Completeness5/5

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

With no output schema, the description compensates by listing the expected return fields (counts, features, bounding box, centroid, etc.), making the tool's behavior clear. Combined with thorough schema parameter documentation and annotations, it gives an agent sufficient context to invoke the tool correctly, including payment flow reference.

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?

The schema provides 100% coverage of all four parameters with detailed explanations, so the baseline is 3. The description does not add new parameter-level details but reinforces that the tool handles PLY files in both ASCII and binary forms, which indirectly informs file handling.

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 it extracts metadata from a PLY file, supporting both ASCII and binary formats, and enumerates specific outputs (vertex/face counts, feature detection, bounding box, centroid). This distinguishes it from sibling format_* tools by specifying the PLY file type as the target.

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 clearly implies usage for PLY files, and the sibling tool list indicates alternatives for other formats. However, it does not explicitly name those alternatives or state exclusion criteria, though it does reference format_auto for payment flow details.

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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