Conciseness

The body avoids explaining known concepts, but repeats guidance: "Reuse history already supplied in context" (line 43) restates "Reuse either source's findings when already in context" (line 27); "do not assume it inherits the conversation" (line 71) repeats "the fork does not inherit the conversation" (line 132); and no-repeat-retrieval rules appear across three sections. It is mostly efficient but could be noticeably tightened.

Actionability

Concrete, executable guidance throughout: numeric budgets ("two search rounds, three candidate sessions read, and a brief of at most roughly 600 tokens"), a copy-paste brief template, exact fallback strings ("No useful prior-session context found within <scope/budget>", "Session history unavailable"), and host-specific tool names. The minor gap is the absence of a worked example of a filled-in finding.

Workflow Clarity

A clearly sequenced procedure (Establish task/access -> Retrieve within budget -> Admit evidence -> Return brief) with explicit checkpoints: stop conditions ("Stop when useful evidence is sufficient, only topical matches remain, or the budget is exhausted"), a verification step ("Check current-state claims against current code, tests, or issue state before relying on them"), a follow-up feedback loop for material gaps, and complete fallback branches for no-match, partial, and unavailable history.

Progressive Disclosure

With no bundle files, the skill is a self-contained SKILL.md with well-organized, clearly headed sections appropriate to its size. The host-specific guidance section (Amp/Claude Code/Codex details) could arguably live in a reference file, a minor organization gap that keeps it below 5.

Specificity

"Retrieves task-relevant prior sessions and returns a short, cited brief of decisions, corrections, failed approaches, and unresolved work" names two concrete actions with an enumerated list of deliverable content. It lists several specific actions with minor coverage gaps rather than the comprehensive multi-action coverage of a 5.

Completeness

It explicitly answers both what ("Retrieves task-relevant prior sessions and returns a short, cited brief of decisions, corrections, failed approaches, and unresolved work") and when ("Use after the initial intent frame and before finalizing the approach, when asked to find related work, or when a concrete history gap could change the approach") with concrete trigger phrases.

Trigger Term Quality

Natural user phrases are present ("find related work", "prior sessions", "history gap"), giving good keyword coverage. Common synonyms such as "past conversations" or "previous chats" are missing, so it falls short of comprehensive 5-level coverage.

Distinctiveness Conflict Risk

The session-history-retrieval niche with triggers like "find related work" and "concrete history gap" is mostly distinct. There is minor overlap risk with general memory/recall-style skills, which keeps it below a clear-niche 5.