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viralnote

viralnote-mcp

Official
by viralnote

update_post

Edit draft or scheduled posts before publishing. Update caption, media, platforms, schedule time, or change status. Only send fields to change.

Instructions

Edit a draft or scheduled post before it publishes. Send only the fields to change — omitted fields keep their current values. Returns the updated post object. Posts that are already publishing, published, or failed cannot be edited. Common uses: reschedule by passing a new scheduledFor, fix a caption, swap attached media, or convert a draft to scheduled by passing status='scheduled' together with scheduledFor.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
postIdYesId of the draft or scheduled post to edit, from list_posts.
statusNoMove between draft and scheduled. Scheduling requires scheduledFor to be set (here or previously).
captionNoReplacement post text.
mediaIdsNoReplacement carousel media ids (up to 10). Mutually exclusive with libraryItemId.
platformsNoReplacement list of target platforms (replaces the whole list, not a merge).
scheduledForNoNew auto-publish time, ISO 8601 UTC, in the future.
libraryItemIdNoReplacement single media item id. Mutually exclusive with mediaIds.
Behavior3/5

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

No annotations provided, so description carries full burden. It discloses partial update behavior and status restrictions but does not mention auth, rate limits, or potential side effects beyond returning the updated post. Adequate but not exhaustive.

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?

Extremely concise: two sentences plus a list of common uses. No filler, front-loaded with purpose and key constraints.

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?

Given 7 parameters, no output schema, and no annotations, the description covers partial updates, status restrictions, common scenarios, and return value. Missing error handling details, but overall very complete.

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 schema already describes parameters. Description adds value by explaining the partial update pattern and common use cases, but not much new for individual parameters. Baseline 3 with minor uplift.

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 'Edit a draft or scheduled post before it publishes,' providing a specific verb (edit) and resource (post). It distinguishes from siblings like create_post and delete_post by focusing on pre-publication edits.

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

Usage Guidelines5/5

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

Explicitly states when to use (draft/scheduled posts only) and when not to (already publishing/published/failed). Lists common uses like rescheduling, fixing captions, and changing status, providing clear 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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