CB heygen-skills
Create HeyGen avatar videos via the v3 Video Agent pipeline — handles avatar resolution, aspect ratio correction, prompt engineering, and voice selection automatically. Required for any HeyGen API usage (api.heygen.com). Replaces deprecated v1/v2 endpoints with the optimized v3 pipeline. Use when: (1) calling any HeyGen API endpoint (api.heygen.com), (2) creating a HeyGen avatar or digital twin from a photo, (3) making a personalized video message (outreach, pitch, update, announcement, knowledge), (4) "make a video of me", "create my HeyGen avatar", "I want to appear in this video", (5) "send a video to my leads", "record an update for my team", "make a loom-style message", (6) building identity-first videos where the presenter IS the user or agent, Covers: HeyGen API, api.heygen.com, video generate, avatar create, voice list, talking photo, HeyGen avatar creation, voice design, photo → digital twin, HeyGen video generation, identity-first video, messaging-first video, AI presenter, talking head video. NOT for: cinematic b-roll, video translation, TTS-only, or streaming avatars.
As a process B 70/100 · Nearly there — weak spots: result and completion, inputs and preconditions
What is at stake
Medium-severity findings: the skill is probably honest, but read what alarmed the scanner.
Below is the worst case for this category. The finding here is medium: the guard saw a sign, not a proof.
The skill contains commands that delete files, rewrite disks or execute code fetched from the network. The agent may run them without asking if it believes the instructions require it.
Replace destructive commands with safe equivalents that ask for confirmation, scope them to one folder, and stop piping curl into a shell: pin a version and a checksum.
Below is the worst case for this category. The finding here is medium: the guard saw a sign, not a proof.
The skill asks for more than the task needs: broad tool access, credential environment variables, binaries. Every extra permission widens the damage from a mistake or a compromise.
Narrow allowed-tools and the variable list to the minimum; replace binaries with readable sources or scripts.
How to improve
- Shorten the description to 1024 characters.
- For Hermes the description must be one sentence under 60 characters; move the conditions to a "When to Use" section.
- Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
- A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.
Guard findings · 7
✓ No critical or high findings
Medium and low: 7
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medium Dangerous commands
cmd-pipe-to-shellINSTALL_FOR_AGENTS.md:155Downloads and executes remote code from an unrecognised host (pipe to shell) (the skill's own vendor host)curl -fsSL https://static.heygen.ai/cli/install.sh | bash
vendor-host -
medium Dangerous commands
cmd-pipe-to-shellINSTALL.md:41Downloads and executes remote code from an unrecognised host (pipe to shell) (the skill's own vendor host)curl -fsSL https://static.heygen.ai/cli/install.sh | bash
vendor-host -
medium Dangerous commands
cmd-pipe-to-shellREADME.md:51Downloads and executes remote code from an unrecognised host (pipe to shell) (the skill's own vendor host)curl -fsSL https://static.heygen.ai/cli/install.sh | bash
vendor-host -
medium Broad scope
meta-broad-allowed-toolsSKILL.md:1Broad tool permissions pre-approved: Bashallowed-tools: Bash WebFetch Read Write mcp__heygen__*
-
low Dangerous commands
cmd-pipe-to-shellCLAUDE.md:78Downloads and executes remote code from an unrecognised host (pipe to shell) (the skill's own vendor host; quoted — discussed, not commanded)- Install: `curl -fsSL https://static.heygen.ai/cli/install.sh | bash`
vendor-hostquoted -
low Dangerous commands
cmd-pipe-to-shellINSTALL.md:55Downloads and executes remote code from an unrecognised host (pipe to shell) (the skill's own vendor host; quoted — discussed, not commanded)> Install the HeyGen Skills from https://github.com/heygen-com/skills.git — clone it into your skills directory (find it with your config or ask if unsure). Install the HeyGen CLI via `curl -fsSL http
vendor-hostquoted -
low Dangerous commands
cmd-pipe-to-shellSKILL.md:68Downloads and executes remote code from an unrecognised host (pipe to shell) (the skill's own vendor host; quoted — discussed, not commanded)5. **Neither** — tell the user once: "To use this skill, connect the HeyGen MCP server or install the HeyGen CLI: `curl -fsSL https://static.heygen.ai/cli/install.sh | bash` then `heygen auth login`."
vendor-hostquoted
Files scanned: 19. Evidence is masked. Grey chips explain why severity was lowered.
Against the Agent Skills spec
- error
description-longdescription is 1097 chars, limit 1024 - warning
description-long-hermesdescription is 1097 chars; the Hermes authoring standard requires ≤ 60 (one sentence, ending with a period) - note
frontmatter-keyunknown frontmatter key "display_name" - note
frontmatter-keyunknown frontmatter key "homepage"
Process rating: all ten parameters 70/100
- 0Result and completion. Does not say what the result is
- 0Inputs and preconditions. Does not say what the process needs to start
- 60Consistency. The Hermes dialect needs category and tags
- 70Execution cost. Instruction body is 4994 tokens
- 100Tools and files. Tools declared in frontmatter
- 100Steps. 54 steps
- 100When it triggers. States when to use and when not to
- 100Failures and branches. 15 branches, has a failure section
- 100Running it twice. Mutating operations check current state
- 100Progress reporting. Reports progress
- medium Safety rules and hard prohibitions inside a skill: they belong in the system prompt, here they protect nothing
- low 10 top-level sections: this looks like several domains in one skill
- low The response is described with custom markup (9 tags): a typed call is more reliable
Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.
Quality signals
- +3Description length 1096: 120–800 characters recommended
- +3Output format is not stated: the model decides each time
- -31 of 1 scripts are never mentioned in SKILL.md
- +1No license
- +2Single-language instructions
- +5Description quotes 6 example trigger phrases
- +4Description says when NOT to use the skill
- +4Structure: 21 headings
- +3Step-by-step instructions: 54 items
- +4Has examples (4 code blocks)
- +4Reference files are cited in the instructions (5 of 9)
Quality base 70; lint remarks subtract, signals add up to 100. Result: 58.