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 agentmods add skills/synaptiai/agent-capability-standard/checkpointnpx skills add synaptiai/agent-capability-standard --skill checkpointgit clone --depth 1 https://github.com/synaptiai/agent-capability-standardWrote 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/synaptiai/agent-capability-standard/checkpoint)<a href="https://agentmods.dev/skills/synaptiai/agent-capability-standard/checkpoint"><img src="https://agentmods.dev/badge/skills/synaptiai/agent-capability-standard/checkpoint.svg" alt="Measured on agentmods" 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 | $0.00037 | $0.02439 |
| Opus 5 | $0.00018 | $0.01220 |
| Sonnet 5 | $0.00007 | $0.00488 |
| Haiku 4.5 | $0.00004 | $0.00244 |
Grade A, and why
checkpoint 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 4d 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 — 273 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Intent
Execute checkpoint to create a restorable state marker before any mutating operation. This is the foundation of safe agentic execution - enabling rollback if subsequent actions fail.
Success criteria:
- Checkpoint successfully created with unique identifier
- All files/state in scope are captured
- Restore command is documented and tested
- Expiry policy set if applicable
Compatible schemas:
schemas/output_schema.yaml
Inputs
| Parameter | Required | Type | Description |
|---|---|---|---|
scope |
Yes | string|array | Files, directories, or state keys to checkpoint |
reason |
No | string | Why this checkpoint is being created (for audit trail) |
checkpoint_type |
No | enum | Type: git_stash, file_backup, state_snapshot, database_savepoint |
expiry |
No | string | When checkpoint can be garbage collected (e.g., "24h", "never") |
Procedure
-
Identify scope: Determine exactly what needs to be checkpointed
- List all files that will be modified by upcoming mutation
- Include related configuration or state files
- Check for uncommitted git changes in scope
-
Select checkpoint type: Choose appropriate mechanism
git_stash: For git-tracked files (preferred for code changes)file_backup: For non-git files, copy to.checkpoints/state_snapshot: For in-memory or runtime statedatabase_savepoint: For database transactions
-
Capture pre-mutation state: Execute the checkpoint
- For git:
git stash push -m "checkpoint:<id>:<reason>" - For files: Copy to
.checkpoints/<id>/with manifest - Record hashes of all captured content
- Verify checkpoint integrity immediately after creation
- For git:
-
Generate restore command: Document how to rollback
- Exact command(s) to restore state
- Any prerequisites for restoration
- Order of operations if multiple systems involved
-
Ground claims: Attach evidence of checkpoint creation
- Format:
tool:bash:<command>,file:<checkpoint_path> - Include hash verification output
- Format:
What ships with it
2 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.
- 4d ago First seen · 273 lines · 37 tokens per session scan A fbb05b6169b5
checkpoint is a skill published in the GitHub repository synaptiai/agent-capability-standard (4 stars, last pushed 4d ago), licensed Apache-2.0. It adds 37 tokens to every session and 2,439 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 2026-08-31.
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