coinbase_paper_ledger

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

Explicitly declares 'Read-only' and enumerates returned data. Without annotations, this provides good behavioral context, though it could mention any required state (e.g., paper trading active).

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?

Single sentence concisely lists contents and states read-only nature. No wasted words, front-loaded with action verb.

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?

Description covers key return data and read-only nature. Lacks mention of prerequisites (e.g., paper mode must be running), but overall adequate for its 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?

No parameters exist, so description does not need to elaborate. Baseline score of 4 is appropriate for zero-parameter tool with full schema coverage.

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?

Description clearly states it reads the in-memory PAPER trading ledger and lists specific data: position, P&L, fills, half-Kelly sizing. It differentiates from sibling tools like coinbase_place_order (write) and coinbase_portfolio_snapshot (live).

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?

Description implies usage for paper trading status but offers no explicit guidance on when to use versus alternatives (e.g., coinbase_portfolio_snapshot). No exclusions or prerequisites mentioned.

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