end_transaction

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

With no annotations present, the description carries the full behavioral burden, and it does disclose the key risk that unsaved work in that transaction can be lost — valuable and non-obvious. However, it does not say what happens if no transaction is active, whether the call is idempotent, or whether ending commits or discards pending changes.

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 short sentences with no waste. The scope constraint leads and the loss-of-work warning is placed where it will actually be read before invoking, so every clause 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?

For a zero-parameter, no-output-schema tool this is nearly sufficient: scope plus the destructive consequence are both covered. The remaining gap is the no-active-transaction / error behavior, which is minor given the tool's simplicity.

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?

The tool takes zero parameters, so the schema has nothing that needs compensating for; the baseline for a no-argument tool applies. The description's session-scoping language ('the configured session's') usefully clarifies that the target is implicit rather than passed in.

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 states a specific verb and resource ('End ... current transaction') and narrows scope to 'the configured session's current transaction,' which meaningfully differentiates it from the other transaction sibling. It stops short of naming launch_transaction as its counterpart, so the pairing must be inferred from the sibling list rather than the description.

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?

Usage is implied rather than stated: the agent can infer this is how a transaction session is closed, and the 'configured session' constraint hints at a prerequisite. There is no explicit guidance on when to end versus leave a transaction open, and launch_transaction is never referenced as the alternative.

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