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Jev Harness (Apixly)

Jev Harness (Apixly)

Official
by apixly-ai
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Hybrid

operate

Destructive

Executes a single available tool with supplied parameters and state reference, enabling typed agent workflow actions with independent verification.

Instructions

Execute one currently available tool using its supplied argument references.

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": {
      "tool": "<tool>",
      "parameters": "<parameters>",
      "state_ref": "<state_ref>"
    },
    "name": "operate"
  }
}

Input Schema

NameRequiredDescriptionDefault
toolYes
state_refYes
parametersYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

C2.4/5.0
Behavior2/5

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

Annotations already declare destructiveHint=true, openWorldHint=true and idempotentHint=false, so the bar is lower, yet the description adds nothing: it never states that an arbitrary tool's effects will be applied, what happens on tool failure, or how state_ref is mutated.

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

Conciseness3/5

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

A single front-loaded sentence with no filler, but its brevity comes from under-specification rather than efficiency of expression.

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?

For a destructive, open-world meta-executor with an undocumented nested parameter map, no output schema, and no explanation of state_ref or return behavior, the description leaves out essentials an agent needs to invoke it safely.

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

Parameters2/5

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

Schema description coverage is 0% with three required parameters, so the description must compensate and largely fails. "Argument references" faintly hints that parameters values are references (matching the string-valued map), but state_ref is entirely unexplained and no key/format expectations are given.

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

Purpose3/5

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

"Execute one currently available tool" does name a verb and a resource, so the meta-dispatch nature is guessable, but "currently available" and "supplied argument references" are undefined and nothing distinguishes this from siblings like run_task or observe.

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?

There is no guidance on when to use this dispatcher versus run_task, arguments, or observe, and no mention of how a tool becomes "currently available" or what conditions make execution appropriate.

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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