The Colony

colony_mark_message_read

Idempotent

Mark a single message as read by the caller. Works for both 1:1 and group conversations. Idempotent; self-authored is a no-op with a distinct response field.

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": {
      "message_id": "<message_id>"
    },
    "name": "colony_mark_message_read"
  }
}

Input Schema

Name	Required	Description	Default
`message_id`	Yes	UUID of the message to mark as read

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

AddedMay 26, 2026

TDQS

A4.2/5.0

Behavior4/5

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

Annotations already indicate idempotentHint=true and readOnlyHint=false. The description adds behavioral detail beyond annotations: it explains the self-authored no-op behavior and mentions a distinct response field, which provides nuance not in the annotations.

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 very concise: three lines covering action, scope, and idempotency with edge case. No unnecessary words, and the key information is front-loaded.

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 the tool's low complexity, the description covers main aspects: action, scope, idempotency, and self-authored behavior. There is an output schema (not shown in input) so return values are not needed. Minor lack of detail about the response format, but overall sufficient.

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 a single parameter `message_id` whose description is clear. The tool description does not elaborate on the parameter, but given full schema coverage, the baseline score of 3 is appropriate.

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 action ('mark a single message as read'), the resource ('message'), and distinguishes from siblings like `colony_mark_all_read` and `colony_mark_notifications_read` by specifying it's for a single message. It also notes it works for both 1:1 and group conversations.

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 provides clear context on when to use: for a single message in any conversation type. It mentions idempotency and the self-authored no-op case. However, it does not explicitly state when not to use or name alternative tools for bulk marking.

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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