session.open

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

No annotations are provided, so the description carries the full burden of disclosing behavioral traits. The description is minimal and does not reveal potential side effects such as whether the file is loaded, permissions required, or if the session is modifiable (e.g., read_only parameter hints at write safety but is not explained). It does not specify what happens on failure or if duplicate opens are allowed, leaving important behaviors opaque.

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 very brief (one short sentence), which is efficient but potentially under-specified. It front-loads the core action, but the brevity may sacrifice clarity—every word should add value, and here 'binary' and 'session' are left ambiguous. A slightly longer description with context would boost its helpfulness without padding.

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?

Given the complexity (5 parameters, one nested object), and the lack of output schema or annotations, the description is incomplete. It does not explain the return value, what constitutes a 'session', or how parameters like 'options' are structured. With many sibling tools doing similar tasks (e.g., 'session.open_bytes', 'session.open_existing'), the description does not help the agent distinguish or use the tool correctly for its intended purpose.

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% (no descriptions for any of the 5 parameters), and the description adds no parameter-specific meaning beyond the parameter names. For example, 'options' is described only as 'object' with no guidance on valid fields, and 'deterministic' or 'update_analysis' have no explanation, making it hard for the agent to use the tool effectively. The description must compensate for this missing schema info but fails to do so.

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 'Open a binary and create a session' clearly states the verb ('Open') and two resources ('binary' and 'session'), indicating the tool's primary role. However, it is vague about what 'session' means in this context (e.g., a workspace for analysis) and does not distinguish itself from siblings like 'session.open_bytes' or 'session.open_existing', which also deal with opening resources. The purpose is clear at a high level but lacks the specificity to differentiate from other session-related tools.

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 provides no guidance on when to use this tool versus siblings such as 'session.open_bytes' (for opening raw byte data) or 'session.open_existing' (for reopening a prior session). There are no usage instructions, prerequisites (e.g., file format support), or alternative scenarios mentioned, leaving the agent to guess the tool's role in the workflow.

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