manage_history

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

With no annotations, the description carries the full burden and largely meets it: it warns that navigation actions can trigger page loads or redirects, that 'reload' bypasses the cache, that 'back'/'forward' only apply 'if available', and what 'list' returns. It does not mention whether history is per-tab vs session scoped or any failure mode when no history entry exists, so it falls short of a 5.

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?

Front-loaded with the core purpose and a use-for routing sentence before the Args block, which is the right ordering. There is mild redundancy – 'reload' semantics are stated twice (summary line and Args entry) – but the extra lines are informative rather than filler.

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 single-enum-parameter tool with an output schema already covering return values, the description covers everything an agent needs: action semantics, side effects, and the sibling to use for arbitrary URLs. Nothing material is left for the agent to infer.

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 supply parameter meaning, and it does: each enum value is documented with its effect ('reload' ignoring the cache, 'list' returning position and entries, back/forward conditional on availability). Only the default ('list') is not restated, which is minor given it is captured in the schema's default field.

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 (manage/inspect) and resource (current browser tab's navigation history), then enumerates the four actions it performs. It also names the sibling it is not (open_url) so the agent can disambiguate navigation-vs-history behavior without inspecting either schema.

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?

Explicitly routes each action: 'back'/'forward' for history navigation, 'reload' for cache-bypassing refresh, 'list' to inspect history, and directs the agent to open_url for arbitrary URL navigation. It also tells the agent to call get_page_info afterward to verify the result, which is a concrete follow-up guideline.

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