Conciseness

The body is lean, assumes Claude's competence ('follow the procedure exactly'), and explains no known concepts. Not 5 because the 4-item Troubleshooting section duplicates the reference file's Troubleshooting nearly verbatim, and the summary paragraph re-states the Overview, so a few tokens could be trimmed. Not 3 because there is no unnecessary explanation or padding beyond that duplication.

Actionability

As an instruction-only skill it gives concrete direction: the exact procedure file to follow, the minimum required parameters ('requester and accepter VPC IDs'), and specific troubleshooting fixes ('Replace existing routes instead of creating new ones', 'Both VPCs must have DNS resolution and DNS hostnames enabled... not just the peering connection options'). Not 5 because the body contains no quick-start command example (e.g., the create-peering CLI call) for the most common case. Not 3 because the guidance is specific and complete once the one-level reference is followed.

Workflow Clarity

The multi-step lifecycle is clearly sequenced ('validates both VPCs exist, checks for CIDR overlap, creates and accepts the peering, updates all route tables, and configures DNS resolution') and delegated to a procedure that includes verification steps. Not 5 because validation checkpoints are described rather than instructed in the body itself — the explicit validate/fix/retry loops live only in the referenced file. Not 3 because validation of the batch route-table operation is present and signposted (CIDR-overlap check, 'updates all route tables in both VPCs').

Progressive Disclosure

Clear overview with a well-signaled, one-level-deep reference ([references/vpc-peering-connection.md](references/vpc-peering-connection.md) exists in the bundle and itself contains no nested references), plus inline quick-answer troubleshooting; content is appropriately split between overview and procedure. Matches the 5 anchor (clear overview, well-signaled one-level references, easy navigation); the minor inline/reference troubleshooting overlap is a defensible quick-reference design, not a navigation gap.

Specificity

The description lists multiple concrete actions — 'Establishes VPC peering connections', 'validates CIDR overlap', 'updates all route tables in both VPCs', 'configures DNS resolution', 'provides security group guidance' — covering the full peering lifecycle. Not score 4 because coverage of the domain's operations is comprehensive rather than having minor gaps.

Completeness

Both parts are explicitly present: a clear 'what' ('Establishes VPC peering connections... validates CIDR overlap, updates all route tables... configures DNS resolution') and an explicit 'when' ('Always use this skill when creating or managing VPC peering'). Not 5 because the when-clause uses a single trigger phrase rather than concrete trigger variations (e.g., 'when the user mentions peering, connecting VPCs, or cross-VPC connectivity').

Trigger Term Quality

Good natural keyword coverage: 'VPC peering', 'peering connections', 'route tables', 'CIDR', 'DNS resolution', 'security group' — terms users would actually say. Not 5 because common phrasings like 'connect VPCs', 'peer VPCs', or 'private connectivity between VPCs' as trigger synonyms are absent.

Distinctiveness Conflict Risk

VPC peering is a clear niche with a distinct, unambiguous trigger ('when creating or managing VPC peering'); it is unlikely to fire for adjacent skills like Transit Gateway or VPN setup. Not 4 because overlap risk with closely related skills is minimal given the explicit peering-specific language.