SynapseKit — Python LLM Framework Blog

SynapseKit v1.2.0 — Deploy, Track Costs, Evaluate

2026-03-20T00:00:00.000Z

SynapseKit v1.2.0 ships three capabilities that every production AI team needs but rarely gets from a framework: one-command deployment, cost intelligence, and built-in evaluation.

synapsekit serve — Deploy in one command

pip install synapsekit[serve]
synapsekit serve my_app:rag --port 8000 --reload

Point it at any Python object that's a RAG pipeline, graph workflow, or agent — SynapseKit auto-detects the type and builds a FastAPI app with the right endpoints (/query, /run, /stream, /health). OpenAPI docs included. No boilerplate.

CostTracker & BudgetGuard

Cost control without a SaaS subscription:

from synapsekit import CostTracker, BudgetGuard, BudgetLimit

tracker = CostTracker()
guard = BudgetGuard(BudgetLimit(daily=10.0, per_request=0.50))

with tracker.scope("pipeline"):
    rec = tracker.record("gpt-4o", input_tokens=1000, output_tokens=500)
    guard.check_before(rec.cost_usd)

print(tracker.summary())

BudgetGuard uses a circuit breaker pattern — when a budget is exceeded, it trips OPEN and stops requests until the cooldown passes.

@eval_case + synapsekit test

@eval_case(min_score=0.8, max_cost_usd=0.05)
def test_summarization():
    result = run_my_pipeline("Summarize this document...")
    return {"score": evaluate(result), "cost_usd": tracker.total_cost_usd}

synapsekit test tests/ --threshold 0.7 --format json

Integrates naturally with pytest and CI. Exit code 1 if any case fails its thresholds.

What else is new

PromptHub — local versioned prompt registry
PluginRegistry — community plugins via Python entry points
RedisCheckpointer + PostgresCheckpointer — production graph persistence

Full changelog: v1.2.0

Welcome

2021-08-26T00:00:00.000Z

Docusaurus blogging features are powered by the blog plugin.

Here are a few tips you might find useful.

Simply add Markdown files (or folders) to the blog directory.

Regular blog authors can be added to authors.yml.

The blog post date can be extracted from filenames, such as:

2019-05-30-welcome.md
2019-05-30-welcome/index.md

A blog post folder can be convenient to co-locate blog post images:

The blog supports tags as well!

And if you don't want a blog: just delete this directory, and use blog: false in your Docusaurus config.

MDX Blog Post

2021-08-01T00:00:00.000Z

Blog posts support Docusaurus Markdown features, such as MDX.

tip

Use the power of React to create interactive blog posts.

For example, use JSX to create an interactive button:

<button onClick={() => alert('button clicked!')}>Click me!</button>

Long Blog Post

2019-05-29T00:00:00.000Z

This is the summary of a very long blog post,

Use a comment to limit blog post size in the list view.

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First Blog Post

2019-05-28T00:00:00.000Z

Lorem ipsum dolor sit amet...

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SynapseKit — Python LLM Framework Blog

SynapseKit v1.2.0 — Deploy, Track Costs, Evaluate

synapsekit serve — Deploy in one command​

CostTracker & BudgetGuard​

@eval_case + synapsekit test​

What else is new​