compile

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

Annotations declare readOnlyHint=false, destructiveHint=false, and openWorldHint=true, so the mutating/external nature is already flagged. The description adds real value by naming the external compiler and promising structured errors and warnings, but it omits what happens on failure (non-zero exit? thrown error?), path/installation requirements for MetaEditor, and how timeout expiry is reported.

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?

One front-loaded sentence with a clear verb-resource-return structure and no filler. It is efficient, though its brevity leaves the gaps noted in other dimensions.

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?

With no output schema and zero schema coverage, the description is the only source of detail, and it leaves key facts unstated: the shape of the 'structured errors and warnings' payload, timeout semantics, and failure modes for an open-world call into an external compiler. Adequate to identify the tool, insufficient to invoke it confidently.

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 0%, so the description must carry parameter meaning. It clarifies that 'source' is a single .mq5 file, which is useful, but it never explains timeout_sec, its units, default behavior, or what occurs when the compile exceeds it — leaving half the parameters undocumented anywhere.

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 gives a specific verb (compile), a precise resource (one .mq5 file), the engine used (MetaEditor), and the return shape (errors and warnings). That distinguishes it from siblings like list_experts, though it does not explicitly contrast with run_backtest or smoke_test, which plausibly compile as a side effect.

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?

There is no when-to-use guidance at all: nothing says whether to call this before run_backtest, as a standalone syntax check, or which siblings it replaces. The only implicit guidance is the word 'one', hinting at single-file scope.

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