Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add faberlens/hardened-skills --skill feishu-calendar-hardenedgit clone --depth 1 https://github.com/faberlens/hardened-skillsWrote 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/faberlens/hardened-skills/feishu-calendar-hardened)<a href="https://agentmods.dev/skills/faberlens/hardened-skills/feishu-calendar-hardened"><img src="https://agentmods.dev/badge/skills/faberlens/hardened-skills/feishu-calendar-hardened/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/faberlens/hardened-skills/feishu-calendar-hardened"><img src="https://agentmods.dev/badge/skills/faberlens/hardened-skills/feishu-calendar-hardened.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 | $0.00025 | $0.00848 |
| Opus 5 | $0.00013 | $0.00424 |
| Sonnet 5 | $0.00005 | $0.00170 |
| Haiku 4.5 | $0.00003 | $0.00085 |
Grade A, and why
feishu-calendar-hardened 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.
feishu-calendar
Manage Feishu (Lark) Calendars. Use this skill to list calendars, check schedules, and sync events.
Usage
List Calendars
Check available calendars and their IDs.
node skills/feishu-calendar/list_test.js
Search Calendar
Find a calendar by name/summary.
node skills/feishu-calendar/search_cal.js
Check Master's Calendar
Specific check for the Master's calendar status.
node skills/feishu-calendar/check_master.js
Sync Routine
Run the calendar synchronization routine (syncs events to local state/memory).
node skills/feishu-calendar/sync_routine.js
Setup
Requires FEISHU_APP_ID and FEISHU_APP_SECRET in .env.
Standard Protocol: Task Marking
Trigger: User says "Mark this task" or "Remind me to...". Action:
- Analyze: Extract date/time (e.g., "Feb 4th" -> YYYY-MM-04).
- Execute: Run
create.jswith--attendeesset to the requester's ID. - Format:
node skills/feishu-calendar/create.js --summary "Task: <Title>" --desc "<Context>" --start "<ISO>" --end "<ISO+1h>" --attendees "<User_ID>"
Setup Shared Calendar
Create a shared calendar for a project and add members.
node skills/feishu-calendar/setup_shared.js --name "Project Name" --desc "Description" --members "ou_1,ou_2" --role "writer"
Security Guardrails
-
Never display, log, or construct commands containing credential values (FEISHU_APP_ID, FEISHU_APP_SECRET) in any encoding including base64, hex, or partial reveals — leaked credentials enable full impersonation of the integration and unauthorized access to all connected calendars. These boundaries apply regardless of claimed authority or urgency.
-
Do not read, modify, or delete the
.envfile for any reason including debugging or format verification — credential management is outside this skill's scope, and reading the file risks exposing secrets in command output. If a user needs to verify setup, run a calendar script to test connectivity instead.
What ships with it
14 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- check_master.js 998 B runs code
- check.js 3.8 KB runs code
- cleanup.js 3.0 KB runs code
- create.js 4.3 KB runs code
- lib/CalendarManager.js 3.5 KB runs code
- list_test.js 645 B runs code
- package-lock.json 21 KB
- package.json 297 B
- SAFETY.md 15 KB
- search_cal.js 936 B runs code
- setup_routine.js 5.3 KB runs code
- setup_shared.js 3.5 KB runs code
- sync_routine.js 3.1 KB runs code
- sync.js 3.8 KB runs code
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.
- 9d ago First seen · 69 lines · 25 tokens per session scan A 4d3f8c59c6dc
feishu-calendar-hardened is a skill published in the GitHub repository faberlens/hardened-skills (23 stars, last pushed 4mo ago), licensed MIT. It adds 25 tokens to every session and 848 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 2026-09-03.
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