TinyBase is a reactive data store and synchronization engine for applications. Developers use it to manage changing application data and synchronize it across connected contexts.
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 tinyplex/tinybase --skill build-with-tinybasegit clone --depth 1 https://github.com/tinyplex/tinybaseWrote 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/tinyplex/tinybase/build-with-tinybase)<a href="https://agentmods.dev/skills/tinyplex/tinybase/build-with-tinybase"><img src="https://agentmods.dev/badge/skills/tinyplex/tinybase/build-with-tinybase/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/tinyplex/tinybase/build-with-tinybase"><img src="https://agentmods.dev/badge/skills/tinyplex/tinybase/build-with-tinybase.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00090 | $0.01193 |
| Opus 5.5 | $0.00036 | $0.00477 |
| Sonnet 5.5 | $0.00018 | $0.00239 |
| Haiku 4.5 | $0.00009 | $0.00119 |
Grade A, and why
build-with-tinybase 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 21d 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 — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Build With TinyBase
Prefer a current generated application over reconstructing TinyBase setup from memory. Preserve persistence and synchronization lifecycle ordering, and verify the behavior the user actually needs.
Read The References
Do not recall TinyBase API details from memory. Read the reference covering the task before writing code:
| Reference | Read it when |
|---|---|
| references/architecture.md | Choosing between Store and MergeableStore, a persistence backend, a synchronization approach, or UI bindings |
| references/import-paths.md | Importing anything outside the tinybase root, or checking which Persisters accept a MergeableStore |
| references/lifecycle.md | Creating, starting, reconnecting, or destroying a Persister or Synchronizer, or setting WebSocket paths and channel Ids |
| references/durable-objects.md | Building or debugging a Cloudflare Durable Object sync server |
Select The Architecture
Read references/architecture.md when choosing between Store and MergeableStore, persistence backends, synchronization, or UI bindings.
Confirm that TinyBase fits the task:
- Keep the active application dataset in a JavaScript runtime.
- Use TinyBase for reactive tabular or key-value data, local-first behavior, persistence, synchronization, or framework bindings.
- Do not present TinyBase as a hosted database service.
- Pair it with another database or service when the authoritative dataset is unbounded, primarily queried on a server, or requires managed backend facilities.
What ships with it
5 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.
- 21d ago Changed · +35 lines · +14 tokens per session 56fdbf622ab3
- 1mo ago First seen · 98 lines · 76 tokens per session scan A 66a9cbe2f960
build-with-tinybase is a skill published in the GitHub repository tinyplex/tinybase (5,193 stars, last pushed 8d ago), licensed MIT. It adds 90 tokens to every session and 1,193 once invoked, about $0.0004 per session on Opus 5.5. 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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