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 joe-broadhead/open-cowork --skill time-keepgit clone --depth 1 https://github.com/joe-broadhead/open-coworkWrote 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/joe-broadhead/open-cowork/time-keep)<a href="https://agentmods.dev/skills/joe-broadhead/open-cowork/time-keep"><img src="https://agentmods.dev/badge/skills/joe-broadhead/open-cowork/time-keep/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/joe-broadhead/open-cowork/time-keep"><img src="https://agentmods.dev/badge/skills/joe-broadhead/open-cowork/time-keep.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 | $0.00044 | $0.00759 |
| Opus 5 | $0.00022 | $0.00380 |
| Sonnet 5 | $0.00009 | $0.00152 |
| Haiku 4.5 | $0.00004 | $0.00076 |
Grade A, and why
time-keep 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.
time-keep
Open Cowork’s only agent time engine. Backed by the bundled time-keep native MCP (stdio).
Always call the real tools (function calling). OpenCode exposes them as
time-keep_<tool> — for example time-keep_current_time. Prefer these over
shell date, bash, or inventing times from model memory.
If you do not see time-keep_* tools (for example time-keep_current_time)
in your tool list, say so briefly and stop — do not invent CLI fallbacks
or pretend to call MCP. The desktop app should list time-keep when the
bundled MCP is connected (status bar MCP count).
Tool Map
All tools are exposed as time-keep_<tool> (OpenCode MCP naming):
| Need | Tool id |
|---|---|
| Current time | time-keep_current_time |
| List timezones | time-keep_list_timezones |
| Timezone details + DST | time-keep_timezone_info |
| Convert between timezones | time-keep_convert_timezone |
| Calendar fields (weekday, ISO week, etc.) | time-keep_calendar_query |
| Date add/subtract | time-keep_date_arithmetic |
| Date difference | time-keep_date_diff |
| Parse/format dates | time-keep_date_format |
| Holiday check or list | time-keep_holidays |
| Business day counts | time-keep_business_days |
| Set a timer | time-keep_timer_set |
| Read a timer | time-keep_timer_get |
| List timers by tag | time-keep_timer_list |
| Delete a timer | time-keep_timer_delete |
| Check overdue timers | time-keep_timer_check |
Guardrails
- Default timezone is UTC — always be explicit when it matters.
- Holiday data is offline, bounded to 2000–2030. Mention this when used.
- Timers persist in local SQLite; setting or deleting a timer asks for the user's approval by design.
- Use IANA timezone names. Do not silently accept bare city names.
- Do not hide DST ambiguity — report ambiguous local datetimes as invalid.
- MCP tool failures surface as
isError: true— inspect the JSON error before retrying.
What ships with it
4 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.
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 · 44 tokens per session scan A dafac54fe1f4
time-keep is a skill published in the GitHub repository joe-broadhead/open-cowork (11 stars, last pushed 4d ago), licensed MIT. It adds 44 tokens to every session and 759 once invoked, about $0.0002 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 2026-08-30.
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