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

With no annotations, the description carries the full burden and does disclose meaningful behavior: it is tagged [PUBLIC WRITE], it writes only sidecar output under .braincell/, and it explicitly leaves raw files unmodified. It is silent on idempotency/re-ingest behavior, overwrite handling, and whether the resulting 'proposed' cells require a separate approval step.

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?

One front-loaded sentence with the write-scope tag first and the non-destructive guarantee second; nothing is wasted. Slightly dense packing of scope plus behavior into one clause keeps it from a 5.

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 one-parameter tool with no output schema this covers the essentials of what is written and where. However, with an adjacent accept tool in the sibling list, the missing explanation of what 'proposed cells' mean and how they get accepted leaves a real workflow gap.

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 coverage is 100% and the single folder parameter is fully documented, including the relative-to-workspace-or-data/fs resolution rule. The description adds nothing about the folder beyond repeating 'specified folder', so the baseline 3 applies.

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?

Specific verb ('Ingest') plus resource ('raw files in a specified folder') and a stated effect ('create sidecar proposed cells under .braincell/'). It does not name or differentiate itself from plausible siblings such as load, scan_hierarchy_filesystem, or accept, so it falls short of a 5.

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 says what it does but never states when to choose ingest over load or scan_hierarchy_filesystem, nor any prerequisite or follow-up (e.g., whether ingested cells must later be promoted via accept). Usage is only inferable from the purpose sentence.

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