Conciseness

The core routing table is dense and functional, but there is genuine redundancy: the peptide-target row appears verbatim in both §2 and §4, microbiome rows appear twice in §9, "DO NOT skip routing" warnings repeat in multiple forms, and the 25-row "Bundled Scripts (cross-skill reference)" table inlines other skills' script content that belongs in those sub-skills. Fits 'mostly efficient but includes some unnecessary... could be tightened'; not a 4 because the duplicated rows and cross-skill table are a noticeable share of the body.

Actionability

Fully copy-paste ready throughout: exact invocations `Skill(skill="tooluniverse-rnaseq-deseq2", args="breast cancer")`, concrete `tu run` one-liners with JSON arguments per tool, filename-to-analysis mappings ("`*_counts.csv`+`*meta*.csv` → RNA-seq DE"), and worked tie-break examples ("'calculate the drip rate for this IV' → computational-biophysics"). Specific commands cover the common routing cases.

Workflow Clarity

Clear sequenced decision tree: (1) read question + file list, (2) find matching row, (3) call Skill immediately, (4) follow loaded skill — with fallback loops ("If no keyword matches but filenames indicate a domain → still route", "Still ambiguous: Ask user") and a RULE ZERO checkpoint (check for an authoritative notebook/script before writing any code). Not a 5: no explicit step to verify the invoked sub-skill actually loaded or to handle routing failure after invocation; minor validation gap.

Progressive Disclosure

Good structure: the router's job is inlining the routing table, sub-skill details are correctly deferred ("The full conventions, anti-pattern examples, and code snippets live in the matching sub-skill"), and the one file reference, references/general-strategies.md, exists and is one level deep. Not a 5: the cross-skill Bundled Scripts table and RULE ZERO sub-rules partially duplicate content that belongs in the referenced sub-skills, a minor organization gap.

Specificity

Quotes concrete actions — "run `tu run read_executed_notebook '{...}'` to extract its cell outputs", "pick a sub-skill name from this exact list (never invent): tooluniverse-rnaseq-deseq2 (RNA/miRNA-seq DE, correlation, PCA, clustering, dispersion)" — with exact command syntax and named sub-skills. Not a 5: the sub-skill enumeration is truncated at "chi-square..." and covers only 3 of the router's many destinations, so coverage has minor gaps.

Completeness

Has a clear 'what' ("ToolUniverse plugin router" with an exact read-notebook command and routing list), but no explicit 'Use when...' clause — the only when-condition is the narrow "if the data folder contains `*_executed.ipynb`". Per the guideline that a missing use-when clause caps completeness at 3, and per the anchor 'clear what but when is missing or only weakly implied'.

Trigger Term Quality

Contains many natural scientific phrases users would say — "differential expression", "pathway enrichment", "regression, ANOVA, ordinal/logistic, chi-square", "GO/KEGG/Reactome/GSEA", "PCA, clustering". Not a 5: the list cuts off mid-enumeration, so common variations and synonyms beyond those three domains are missing; not a 3 because the included terms are natural and well-chosen, matching the 'good keyword coverage; a few natural terms missing' anchor.

Distinctiveness Conflict Risk

Tied to a named plugin with distinct triggers — "ToolUniverse plugin router", `tu run` commands, exact sub-skill names — giving it a clear niche with minimal conflict risk against unrelated skills. Not a 5: as a router it claims authority over essentially any data-analysis question, so it overlaps with every sub-skill it routes to by design.