Compile an MQL5 file

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

With no annotations, the description carries the full behavioral burden well. It discloses that compilation happens via MetaEditor CLI, that structured errors/warnings are parsed from the compile log, that success requires both zero parsed errors and a freshly-written .ex5, and that the process exit code is deliberately ignored.

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?

Two compact sentences, front-loaded with the action and return value, followed by the critical success-condition caveat. Every sentence earns its place.

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?

Despite no annotations and no output schema, the description explains the return values and the non-obvious success criteria. It remains incomplete only around the two optional, undocumented parameters (timeoutMs and includePath).

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 only 33%, so the description needs to compensate for undocumented parameters, but it does not mention timeoutMs or includePath at all. It adds no parameter semantics beyond what the schema already provides for path.

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?

States a specific verb (compiles), the exact resource types (.mq5/.mqh/.mqproj), the mechanism (MetaEditor CLI), and the return shape (structured errors/warnings plus .ex5 path). It is clearly distinguishable from the file-operation and backtest siblings.

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?

The description implies the tool is for compiling MQL5 source files but gives no explicit when-to-use, when-not-to-use, or alternative-tool guidance. The file-type scope provides some context, but selection guidance is mostly inferred.

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