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b24_disk_file_content

Read-onlyIdempotent

Download a Bitrix24 Disk file's content as base64. Resolves the download URL server-side to enforce size limits and maintain portal WAF visibility.

Instructions

Download a Disk file's content and return it as base64.

Resolves DOWNLOAD_URL via disk.file.get, then fetches the bytes server-side (so the portal WAF sees the request, not your client). Guarded by max_size_mb.

Returns: {"id","name","size","content_type","base64"} or an error envelope.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
file_idYesDisk file id to download.
max_size_mbNoRefuse to download files larger than this (default 10 MB) to protect the context window.
webhook_urlNoOverride the default incoming webhook for this call (https://<portal>/rest/<user_id>/<token>/). If omitted, uses personal_webhook, then the X-B24-Webhook HTTP header, then the BITRIX_WEBHOOK_URL env default.
personal_webhookNoAct as a specific user (their personal incoming webhook). Takes precedence over webhook_url. Required to write to the portal under that user's permissions.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

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

Annotations indicate readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds that it resolves a download URL and fetches server-side, providing context beyond annotations. No contradictions.

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 concise with 4 sentences, front-loaded with the primary action. Every sentence adds value; no wasted words.

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?

Given the annotations, schema coverage, and output schema hinted in the description, the tool description is complete. It explains the server-side fetch mechanism and safety guard, which are important for agent decision-making.

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% with good descriptions for each parameter. The description reinforces the max_size_mb guard but adds minimal new semantic information beyond the schema.

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 the verb 'Download' and the resource 'Disk file's content', and specifies the output format (base64). It distinguishes itself from sibling disk tools like b24_disk_file_delete.

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 explains when to use this tool (to download file content) and provides context about server-side fetching and WAF considerations. It does not explicitly exclude alternatives, but the purpose is clear.

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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