HiveAttest

attest_custody_append

Append a node to a custody chain (C16: hive-custody). Taint propagates: once tainted, always tainted. Reference-grade implementation. Wire format normative; production-grade is Layer B.

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": {
      "chain_id": "<chain_id>",
      "transform_id": "<transform_id>",
      "agent_did": "<agent_did>"
    },
    "name": "attest_custody_append"
  }
}

Input Schema

Name	Required	Description	Default
`payload`	No	Transform payload (will be hashed)
`chain_id`	Yes	Chain identifier (create new by using a fresh ID)
`agent_did`	Yes	DID of the agent performing the transform
`taint_status`	No	Declared taint status	clean
`transform_id`	Yes	Transform identifier for this step

Schema Changelog

Changes observed during successful MCP inspections.

First observedMay 2, 2026

TDQS

A3.5/5.0

Behavior3/5

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

With no annotations, the description carries the burden of behavioral disclosure. It discloses a key behavior: 'Taint propagates: once tainted, always tainted.' However, it omits side effects, permission requirements, return behavior, and other operational details that would fully inform an agent.

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 short sentences, front-loaded with the primary action. Every phrase adds information, including the taint propagation rule and the Layer B reference, with no wasted words.

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?

Given no output schema and a moderately complex operation, the description is reasonably complete: it explains the operation and taint behavior. However, it lacks information about return values, error conditions, and how the chain_id relates to existing custody chains beyond the schema's hint about creating a new chain.

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 schema already explains all parameters. The description adds semantic context for taint_status via the taint propagation rule, but does not elaborate on other parameters beyond what the schema provides.

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?

States 'Append a node to a custody chain' with a specific verb and resource, and adds the protocol context 'C16: hive-custody'. It does not explicitly distinguish from sibling tools like attest_custody_proof or attest_custody_verify, but the verb 'append' clearly conveys its role.

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?

No explicit when-to-use or alternatives are provided. The phrases 'Reference-grade implementation' and 'production-grade is Layer B' imply a reference/testing context, hinting that this tool may not be for production, but this is not a clear or actionable guideline.

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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