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by com.bernuvia
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zip_upload_link

Issues ONE presigned URL (1 h, the same expiry as every other MCP upload link) to PUT the deliverable ZIP over HTTP; it also returns the uploadToken that submit_for_review requires, which is a different thing and lasts 2 h. It deliberately issues no batches: there is one deliverable per template.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
filenameNoName of the file (e.g. "plantilla.zip").

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
issuedYesAlways 1: there is ONE deliverable per template.
blobUrlYesFinal URL of the file in the private store.
filenameYesSanitized name it is stored under.
maxBytesYesMaximum accepted size, in bytes.
pathnameYesPath inside the store; you repeat it in submit_for_review.
expiresAtYesWhen the upload link expires (ISO 8601).
expiresInYesThe same thing in plain words.
uploadTokenYesMAC that ties the file to your account for the submission.
instructionsYesHow to upload the file and what to do afterwards.
presignedUrlYesSigned URL to PUT the file to.
uploadTokenExpiresInYesHow long the uploadToken lives, in plain words.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed12 schema fields changed
    • changedInput schema / properties / filename / description
      Previous value: -"Nombre del archivo (p. ej. \"plantilla.zip\")."New value: +"Name of the file (e.g. \"plantilla.zip\")."
    • changedOutput schema / properties / blobUrl / description
      Previous value: -"URL final del archivo en el almacén privado."New value: +"Final URL of the file in the private store."
    • changedOutput schema / properties / expiresAt / description
      Previous value: -"Cuándo caduca el enlace de subida (ISO 8601)."New value: +"When the upload link expires (ISO 8601)."
    • changedOutput schema / properties / expiresIn / description
      Previous value: -"Lo mismo dicho en claro."New value: +"The same thing in plain words."
    • changedOutput schema / properties / filename / description
      Previous value: -"Nombre saneado con el que se guarda."New value: +"Sanitized name it is stored under."
    • changedOutput schema / properties / instructions / description
      Previous value: -"Cómo subir el archivo y qué hacer después."New value: +"How to upload the file and what to do afterwards."
    • changedOutput schema / properties / issued / description
      Previous value: -"Siempre 1: el entregable es UNO por plantilla."New value: +"Always 1: there is ONE deliverable per template."
    • changedOutput schema / properties / maxBytes / description
      Previous value: -"Tamaño máximo admitido, en bytes."New value: +"Maximum accepted size, in bytes."
    • changedOutput schema / properties / pathname / description
      Previous value: -"Ruta dentro del almacén; se repite en submit_for_review."New value: +"Path inside the store; you repeat it in submit_for_review."
    • changedOutput schema / properties / presignedUrl / description
      Previous value: -"URL firmada a la que hacer el PUT del archivo."New value: +"Signed URL to PUT the file to."
    • changedOutput schema / properties / uploadToken / description
      Previous value: -"MAC que ata el archivo a tu cuenta para el envío."New value: +"MAC that ties the file to your account for the submission."
    • changedOutput schema / properties / uploadTokenExpiresIn / description
      Previous value: -"Cuánto vive el uploadToken, en claro."New value: +"How long the uploadToken lives, in plain words."
  2. First observed

TDQS

A4.5/5.0
Behavior5/5

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

With no annotations provided, the description carries the full burden and handles it well. It discloses the 1 h URL expiry, the 2 h token expiry, the PUT method, the relationship to submit_for_review, and the no-batch design decision. This goes well beyond a generic 'upload link' description.

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?

Two dense sentences, each earning its place: the first covers the URL and its expiry/method, the second covers the token, its distinct expiry, and the no-batch rationale. The key facts are front-loaded before the clarifying details.

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?

For a one-parameter tool with an output schema, the description is complete: it explains what is issued, how to use it, what submit_for_review requires, and why no batches are involved. An agent has enough information to select and invoke this tool correctly.

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% and the single filename parameter is already documented in the schema. The description adds contextual framing about the deliverable ZIP but does not materially extend the parameter's meaning, so the baseline score of 3 is appropriate.

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 first sentence states a specific verb ('issues ONE presigned URL'), a concrete resource (the deliverable ZIP), and the intended method (PUT over HTTP). It also separates this tool from sibling upload links by noting the 1 h expiry and the distinct 2 h uploadToken returned for submit_for_review.

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 makes the tool's role clear: it produces the presigned URL and token needed for submission, and it deliberately issues no batches because there is one deliverable per template. It does not explicitly name sibling alternatives such as evidence_upload_link or image_upload_link, but the deliverable ZIP framing and the submit_for_review dependency give sufficient context.

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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