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WhiteWolf-Cyber

obsidian-vault-mcp

set_note_property

Add or update a YAML frontmatter property in an Obsidian note. Creates frontmatter block if missing, supporting string, number, and boolean values.

Instructions

Set (or add) a YAML frontmatter property on a vault file, creating a frontmatter block if none exists.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
keyYes
pathYes
valueYes
Behavior4/5

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

With no annotations provided, the description carries full burden. It discloses that the tool creates a frontmatter block if none exists, which is a key behavioral trait. However, it does not mention overwrite behavior or file existence handling.

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 sentence with no wasted words. It concisely conveys the essential action and boundary condition.

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

Completeness3/5

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

For a tool with 3 required parameters and no output schema, the description covers the core action but lacks parameter documentation and usage context. It is minimally adequate but has clear gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters1/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, yet the description provides no explanation of the parameters (key, path, value) beyond their names. It fails to add meaning about types, constraints, or roles, making it insufficient for selecting and invoking the tool correctly.

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 specifies the action ('set or add') and the resource ('YAML frontmatter property on a vault file'), and distinguishes from sibling tools like get_note_property. It also clarifies the behavior of creating a frontmatter block if none exists.

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 when to use the tool (when setting a frontmatter property) but does not explicitly state when not to use it or mention alternatives. It lacks guidance on distinguishing from similar tools like patch_vault_file.

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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