Conciseness

There is no conceptual padding or explanation of things Claude already knows, but the body could be tightened: [prompt-optimizer.md](references/prompt-optimizer.md) is linked five times (lines 45, 48, 53, 61, 82) and [visual-styles.md](references/visual-styles.md) four times, and the "Tool Selection" table (generate/get/list/delete) substantially repeats the "Quick Reference" table. This fits anchor 3 ("could be tightened") better than anchor 4 ("minor instances") because the duplication spans multiple sections, while the absence of any prose fluff keeps it well above anchor 2.

Actionability

Guidance is mostly executable: a complete copy-paste curl example with auth header and JSON body (lines 24-28), exact MCP tool names and REST endpoints in the selection table, and named config parameters ("duration_sec, orientation, avatar_id"). It falls short of anchor 5 because the polling step and MCP call payloads are delegated to reference files without an inline example, and short of nothing below 4 since what is inline can be run as-is.

Workflow Clarity

Two clearly sequenced numbered workflows ("With MCP tools" and "Without MCP tools (direct API)", lines 47-55) each with a prompt-optimization precondition, and polling status as an explicit checkpoint ("Call mcp__heygen__get_video ... to poll status and get the download URL"). Minor validation gaps — no guidance on what to do when the video status is failed — place it at anchor 4 rather than anchor 5; the sequence is clear and checkpoints explicit, so it is above anchor 3. No destructive/batch cap applies.

Progressive Disclosure

Verified against the actual bundle: all 9 files in references/ are cited from the body with one-line descriptions, grouped into "Core Workflow" and "Foundation", and each is substantive (195-502 lines) rather than a pointer chain — cross-links between references are siblings, so navigation is one level deep. The body is a lean overview with the bulk of detail appropriately split into references, matching anchor 5 ("Clear overview with well-signaled one-level-deep references; content appropriately split; easy navigation").

Specificity

The description names the domain and one concrete action — "Create videos from a text prompt using HeyGen's Video Agent" — but the six enumerated clauses are usage triggers, not additional capabilities (no mention of polling status, downloading, or iterating on results). This matches anchor 3 ("Names domain and 1-2 concrete actions, but not comprehensive"): it is above anchor 2 because the action stated is concrete rather than generic, and below anchor 4 because only one capability verb is listed.

Completeness

It explicitly answers both questions: what ("Create videos from a text prompt using HeyGen's Video Agent") and when ("Use when: (1) Creating a video from a description or idea, ... (6) User says \"make me a video\" or \"create a video about X\"") with six concrete trigger clauses including direct user-speech quotes. This matches anchor 5 exactly; anchor 4 would require the 'when' to be less explicit than this six-item enumerated list.

Trigger Term Quality

Good keyword coverage with natural user phrasings quoted directly — "make me a video", "create a video about X", "explainer, demo, or marketing videos", "Quick video prototyping or drafts". It falls short of anchor 5's comprehensiveness because common variations like "generate a video", "text-to-video", or "short video/clip" are absent, but it is clearly above anchor 3's "missing common variations".

Distinctiveness Conflict Risk

The carve-out "Making a video without specifying exact avatars, voices, or scenes" explicitly distinguishes it from the closely related avatar-video skill, and "HeyGen's Video Agent" pins the niche. It is mostly distinct with minor overlap risk (a bare "make me a video" request could route to either skill), fitting anchor 4 rather than anchor 5's "minimal conflict risk".