Agent Skill

Update Harness Dependencies skill

update-harness-dependenciesvercel/aiskills/update-harness-dependencies/SKILL.md

Update the primary SDK dependencies of harness packages. Use when asked to update the harness SDKs or harness adapter dependencies.

27k

always on

29 tokname + description

once used

1,659 tokSKILL.md body

bundled files

repo stars

27kGitHub

Install the Update Harness Dependencies skill

Skills CLI (Claude Code, Codex, Cursor and others)

npx skills add https://github.com/vercel/ai --skill update-harness-dependencies

Claude Code, by hand (all projects)

git clone --depth 1 https://github.com/vercel/ai.git /tmp/ai
mkdir -p ~/.claude/skills
cp -R /tmp/ai/skills/update-harness-dependencies ~/.claude/skills/update-harness-dependencies

For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.

What it costs your context

Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.

When	What loads	Cost
Every session	Name and description	29 tok
When the agent uses it	The SKILL.md instructions	1,659 tok
Only if opened	No bundled files	—

Until it is used, update-harness-dependencies costs about 47× less than the median MCP server we measured (1,362 tokens on every turn). Installing all 14 skills from vercel/ai would load 683 tokens of descriptions. Skills vs MCP study

Checks

Our checks found nothing to flag: it follows the Agent Skills specification's naming and size guidelines and doesn't pipe downloads into a shell.

Checked 2026-10-22 · method

What's inside

The headings of its SKILL.md. Read the full file on GitHub.

Update the harness packages
Update the harness dependency packages
Update ACP and MCP SDKs everywhere
Align ACP npm-locked bridge manifests
Verification

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