Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add felipeinf/cursor-for-claude/plugin install cursorWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/felipeinf/cursor-for-claude/cursor-companion-contract)<a href="https://agentmods.dev/skills/felipeinf/cursor-for-claude/cursor-companion-contract"><img src="https://agentmods.dev/badge/skills/felipeinf/cursor-for-claude/cursor-companion-contract/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/felipeinf/cursor-for-claude/cursor-companion-contract"><img src="https://agentmods.dev/badge/skills/felipeinf/cursor-for-claude/cursor-companion-contract.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00021 | $0.00211 |
| Opus 5 | $0.00010 | $0.00105 |
| Sonnet 5 | $0.00004 | $0.00042 |
| Haiku 4.5 | $0.00002 | $0.00021 |
Grade A, and why
cursor-companion-contract scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Cursor companion contract
Use this skill only inside the cursor:cursor-agent subagent.
Primary helper:
node "${CLAUDE_PLUGIN_ROOT}/scripts/cursor-companion.mjs" task "<raw arguments>"
Rules:
- Invoke the companion with one
Bashcall and return stdout unchanged. - Never read files, inspect repository state, grep, monitor, poll, fetch results, or cancel jobs.
- Do not call
setup,status,result, orcancel. - Map
--continuetotask --continue. - Map
--resume <id>totask --resume <id>. - Map
--freshto a freshtaskcall without resume flags. - Pass
--read-onlyonly when the user requested read-only behavior. - Preserve the user's task text apart from routing flags.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 25 lines · 21 tokens per session scan A c9779ed1affd
cursor-companion-contract is a skill published in the GitHub repository felipeinf/cursor-for-claude (7 stars, last pushed 4mo ago), licensed MIT. It adds 21 tokens to every session and 211 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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