devcontainer_add_extensions

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

No annotations are provided, so the description carries full responsibility for behavioral disclosure. It does not state that the tool modifies the devcontainer configuration in place, whether it creates missing files, whether settings are merged or overwritten, or what authentication/api_key requirements exist. The mutation behavior is only implied by 'Add.'

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

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

The description is a single, front-loaded sentence with no filler. Every word contributes meaning, and the main action and target are immediately clear.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has no annotations and no output schema, yet the description omits key contextual information: whether it requires an existing devcontainer, how it interacts with devcontainer_generate and devcontainer_configure, and what happens when settings or extensions already exist. This makes it under-specified for reliable agent invocation.

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

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

Schema description coverage is 100%, so the schema already documents all three parameters. The description adds minimal value by naming 'extensions and editor settings,' which aligns with the extensions and settings parameters, but it does not clarify the role of api_key or add any syntax or precedence details beyond the schema.

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

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

The description uses a specific verb and resource: "Add VS Code extensions and editor settings to a devcontainer configuration." It clearly identifies the target artifact and the two kinds of additions, distinguishing it from siblings like devcontainer_generate and devcontainer_configure without requiring schema inspection.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given about when to use this tool versus alternatives like devcontainer_generate or devcontainer_configure. The phrase 'to a devcontainer configuration' implies an existing configuration, but it never states whether this tool should follow creation or configuration steps, nor what to do if no devcontainer exists yet.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.