reassemble_j1939_multipacket

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

No annotations are supplied, so the description carries the full burden. It hints at the transformation performed but says nothing about whether it is read-only, where results go, how incomplete or malformed sessions are handled, or whether the whole log is scanned. That is a significant gap for an unannotated tool.

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?

A single front-loaded sentence with no filler, and the PGN identifiers add useful precision. It is efficient, though it could spend a few extra words on the log_path parameter without becoming bloated.

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?

With no annotations, no output schema, and an undocumented required parameter, the definition leaves key questions open: return format (payload list vs. decoded map), handling of partial sessions, and input file expectations. The domain specificity is good, but the definition is under-specified for correct invocation.

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 the sole parameter log_path is undocumented in both schema and description. The description does not clarify whether log_path points to a raw candump/ASC file, whether it must contain J1939 transport frames, or what path semantics apply.

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 ("Reassemble") and a precisely scoped resource (J1939 BAM/CMDT transport-protocol sessions, PGN 0xEC00/0xEB00) plus the output (complete multi-byte PGN payloads). It is easy to distinguish from generic siblings like summarize_trace_log or query_decoded_signals, though no sibling is named explicitly.

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 only implied: an agent can infer this applies when a log contains multi-packet J1939 transport sessions that need joining. There is no explicit when-to-use, when-not-to-use, prerequisite (e.g., raw frame log required), or alternative tool routing.

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