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

Annotations already cover the safety profile (readOnlyHint=true, openWorldHint=true, destructiveHint=false). The description adds a small behavioral nuance — that the default timeframe of 1D applies specifically to stocks — but says nothing about what the 'categories' are, whether data is delayed, or how results are scoped. With annotations carrying the safety burden, a 3 is appropriate.

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?

Purpose sentence is front-loaded, followed by a compact Args block. No redundant restatement of the title or filler. Slightly raw docstring formatting, but every line 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 read-only overview tool with no output schema, the description should convey what the overview contains — it mentions 'category' and 'stocks per category' but never names or characterizes those categories. Enough to invoke correctly, not enough to know what comes back or how it differs from market_snapshot.

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% and there are no enums, so the description carries the full parameter burden — and it largely does: it enumerates all seven timeframe values (5m through 1M) and caps limit at 20 stocks per category. Minor gaps remain (what happens above 20, whether the timeframe enum is validated) but this is meaningful compensation.

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 ('Get a comprehensive overview') and resource (Egyptian Exchange market), which is clearly broader in scope than siblings like egx_index_analysis or egx_sector_scan. It stops short of explicitly naming those narrower siblings, so it's clear but not maximally differentiated.

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 only documents arguments; it never says when to reach for this tool versus egx_index_analysis, egx_sector_scan, egx_sector_scanner, or market_snapshot. No prerequisites, no exclusions, no routing guidance.

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