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hostodo_install_artifact

Install a verified artifact to a VM filesystem by downloading, checking SHA-256, setting ownership and permissions, and moving it atomically to the target path.

Instructions

Install a previously uploaded artifact to the VM filesystem. Downloads the artifact to the VM, verifies SHA-256, sets ownership and permissions, and atomically moves to the destination path. Requires vms:exec scope and mcp_exec_enabled on the target VM.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
modeNoFile permissions in octal (e.g., '0644', '755'). Default: '0644'.0644
ownerNoFile owner in 'user' or 'user:group' format. Default: 'root'.root
artifact_idYesArtifact ID from hostodo_create_artifact_upload.
destination_pathYesAbsolute path where the file will be installed. Parent directories will be created if needed. Certain system paths are denied.
Behavior4/5

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

No annotations provided, so description carries full burden. It discloses the sequence of operations (download, SHA-256 verify, ownership/permissions, atomic move) and the authentication/scope requirement. Does not cover error handling or denied paths in detail, but is fairly transparent.

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?

Description is concise, front-loaded with the purpose, and uses only three sentences with no redundant information.

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 absence of output schema and moderate complexity, the description covers the tool's purpose, steps, and prerequisites. Lacks details on return values or error behavior, but is reasonably complete for an installation tool.

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 baseline is 3. The description adds value by explaining the overall process but adds little parameter-specific detail beyond the schema. The mention of parent directory creation is helpful.

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 verb 'install' and the resource 'artifact to VM filesystem', distinguishing it from sibling tools like hostodo_create_artifact_upload which uploads an artifact.

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 explains the steps (download, verify, set permissions, atomic move) and the required scope/exec permission, giving clear context for when to use this tool. It lacks explicit when-not-to-use or alternatives, but the context is sufficient.

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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