Cofferline

renew_delegation

Renew an active delegation: same scope, fresh expiry, no authority gap. Returns a NEW digest to sign and confirm exactly like prepare_delegation. Auth required.

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": {
      "id": "<id>"
    },
    "name": "renew_delegation"
  }
}

Input Schema

Name	Required	Description	Default
`id`	Yes	delegation id (uuid)
`valid_until`	No	optional new expiry, unix seconds; defaults to the original duration

Schema Changelog

Changes observed during successful MCP inspections.

First observedAug 20, 2026

TDQS

A4/5.0

Behavior3/5

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

With no annotations provided, the description carries the full burden. It discloses that auth is required and that the tool returns a new digest for signing, and it clarifies the renewal semantics. However, it does not state side effects, what happens to existing pending confirmations, or behavior on invalid/inactive delegation IDs.

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 two concise sentences with no wasted words. Key facts are front-loaded: the action, scope, expiry, authority gap, and follow-up signing flow.

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?

For a simple two-parameter tool with no output schema, the description covers purpose, required auth, and next-step flow. It could mention error/precondition details, but it is reasonably complete for an agent to select and invoke correctly.

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 baseline is 3. The description adds no additional parameter meaning beyond the schema; it mentions the new expiry concept implicitly but the schema already documents 'valid_until' and its default behavior.

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's action: 'Renew an active delegation' with specific semantics ('same scope, fresh expiry, no authority gap'). It distinguishes itself from siblings like prepare_delegation and revoke_delegation by focusing on renewal of an existing active delegation.

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 gives practical usage context: it applies to an 'active delegation', requires auth, and instructs the agent to follow the same confirm flow as prepare_delegation. It doesn't explicitly state when NOT to use it or name direct alternatives, but the context is clear enough.

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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