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 commands/jsk9999/ai-nexus/checkpointgit clone --depth 1 https://github.com/JSK9999/ai-nexusWrote 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/commands/jsk9999/ai-nexus/checkpoint)<a href="https://agentmods.dev/commands/jsk9999/ai-nexus/checkpoint"><img src="https://agentmods.dev/badge/commands/jsk9999/ai-nexus/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 | $0.00000 | $0.00397 |
| Opus 5 | $0.00000 | $0.00198 |
| Sonnet 5 | $0.00000 | $0.00079 |
| Haiku 4.5 | $0.00000 | $0.00040 |
Grade A, and why
checkpoint scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
100% identical to checkpoint — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
What it actually says
Checkpoint Command
Create or verify a checkpoint in your workflow.
Usage
/checkpoint [create|verify|list] [name]
Create Checkpoint
When creating a checkpoint:
- Run
/verify quickto ensure current state is clean - Create a git stash or commit with checkpoint name
- Log checkpoint to
.claude/checkpoints.log:
echo "$(date +%Y-%m-%d-%H:%M) | $CHECKPOINT_NAME | $(git rev-parse --short HEAD)" >> .claude/checkpoints.log
- Report checkpoint created
Verify Checkpoint
When verifying against a checkpoint:
-
Read checkpoint from log
-
Compare current state to checkpoint:
- Files added since checkpoint
- Files modified since checkpoint
- Test pass rate now vs then
- Coverage now vs then
-
Report:
CHECKPOINT COMPARISON: $NAME
============================
Files changed: X
Tests: +Y passed / -Z failed
Coverage: +X% / -Y%
Build: [PASS/FAIL]
List Checkpoints
Show all checkpoints with:
- Name
- Timestamp
- Git SHA
- Status (current, behind, ahead)
Workflow
Typical checkpoint flow:
[Start] --> /checkpoint create "feature-start"
|
[Implement] --> /checkpoint create "core-done"
|
[Test] --> /checkpoint verify "core-done"
|
[Refactor] --> /checkpoint create "refactor-done"
|
[PR] --> /checkpoint verify "feature-start"
Arguments
$ARGUMENTS:
create <name>- Create named checkpointverify <name>- Verify against named checkpointlist- Show all checkpointsclear- Remove old checkpoints (keeps last 5)
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.
- 5d ago First seen · 75 lines · 0 tokens per session scan A 688a05474a64
checkpoint is a command published in the GitHub repository JSK9999/ai-nexus (19 stars, last pushed 5mo ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 397 tokens. A static security scan graded it A with 0 findings. It is 100% identical to checkpoint, differing in 0 lines, and is treated as a copy.
Other commands, from other repositories
hatch3r-benchmark
Run and analyze performance benchmarks. Compare results against baselines, identify regressions, and produce performance reports.
eval
Evaluate and improve one healthcare agent's system prompt. Run up to 5 iterations of: prepare fixed questions -> answer -> judge -> improve -> re-score -> commit if better.
test-coverage
Analyze test coverage and identify the highest-value gaps to fill.
terse
Switch reply compression level — /terse [lite|full|ultra|off]. Complements RTK (input savings) with output-side savings.
projects
List known projects and their instinct statistics.
csm-workledger
Show the surviving work-ledger entries across sessions.