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Obsidian MCP Server

Obsidian MCP Server

by cupkappu
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
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append_to_active_file

Append content to the currently open note in Obsidian, enabling quick additions without manual navigation.

Instructions

Append content to the currently active file

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "content": "<content>"
    },
    "name": "append_to_active_file"
  }
}

Input Schema

NameRequiredDescriptionDefault
contentYesContent to append

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

C2.9/5.0
Behavior2/5

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

No annotations are provided, and the description carries the full burden of behavioral disclosure. It only states the operation without mentioning side effects (e.g., whether it creates the file if missing, whether it respects file locks, or whether it requires an active file context). The undefined 'active file' concept adds ambiguity rather than clarity.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, front-loaded sentence with no redundant wording. It is appropriately sized for the tool's simplicity, though it could include a bit more context without becoming verbose.

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?

Given the simple schema and lack of annotations, the description is incomplete. The term 'active file' is unsupported and unexplained, which is critical for an agent to know when this tool is relevant. No operational context (e.g., whether the file must already exist, whether the append is atomic) is provided, leaving a gap in understanding for proper invocation.

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?

The schema covers the single parameter 'content' with a description ('Content to append'), so schema coverage is 100%. The tool description adds no additional meaning beyond the schema, so the baseline of 3 is appropriate.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states a specific action ('Append content') and a distinct resource ('currently active file'). It does not explain what 'active file' means, which may create some ambiguity, and it does not explicitly differentiate from sibling tools like append_to_file, but the verb+resource is specific enough for basic comprehension.

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

Usage Guidelines2/5

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

No guidance is provided on when to use this tool versus alternatives such as append_to_file, update_active_file, or create_or_update_file. The phrase 'currently active file' implies a state, but the description does not clarify prerequisites or situations where this tool is preferred, leaving the agent without decision support.

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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