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theYahia

@theyahia/vk-mcp

by theYahia

post_wall

Post messages on VK user or community walls. Supports text, attachments, scheduled publishing, and posting on behalf of groups.

Instructions

Опубликовать запись на стене пользователя или сообщества ВКонтакте.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
messageYesТекст поста
owner_idYesID владельца стены (отрицательный для групп)
from_groupNo1 — от имени группы, 0 — от пользователя
attachmentsNoВложения: photo123_456,video789_012
publish_dateNoОтложенная публикация (unix timestamp)
Behavior2/5

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

No annotations are provided, so the description bears full burden. It does not mention authorization requirements, side effects, rate limits, or that this is a write operation, leaving behavioral traits undisclosed.

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 a single concise sentence with no extraneous words, efficiently conveying the tool's purpose.

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

Completeness2/5

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

The description lacks information about return values, error conditions, and output schema. For a mutation tool with no output schema, the agent would benefit from knowing what the tool returns to confirm success.

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 100%, so the schema documents all parameters. The description adds no additional parameter-level meaning beyond the schema, meeting the baseline of 3.

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 tool posts a record on a VK wall, using a specific verb ('опубликовать') and resource ('запись на стене'). It distinguishes well from sibling tools like get_wall (reading) and send_message (messaging).

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

Usage Guidelines3/5

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

The description implies the tool is for posting walls but provides no explicit guidance on when to use it versus alternatives, no prerequisites, and no exclusion criteria. Usage is implicit.

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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