semantic-cache-key
Stable cache keys for LLM requests. Invariant to harmless variation (whitespace, casing, dict key order); sensitive to material changes (model swap, tool list, retrieval context). Pure stdlib, zero runtime dependencies.
Python port of @mukundakatta/semantic-cache-key -- the canonical-form algorithm matches exactly so a JS frontend and a Python backend can share the same cache.
Install
pip install semantic-cache-key
Usage
from semantic_cache_key import key
cache_key = key(
prompt="Summarize this article in three bullet points.",
model="claude-sonnet-4-5",
tools=[{"name": "fetch_url"}, {"name": "read_pdf"}],
retrieval_context=["doc-id-42", "doc-id-7"],
system="You are a careful research assistant.",
version="v1", # bump to invalidate every cache entry
)
# -> '8d3f7b91c2a04e6f' (16-char hex by default; pass length=64 for full sha256)
Two prompts that differ only in whitespace / casing produce the same key:
key("Hello, World!", "gpt-5") == key("hello, world!", "gpt-5") # True
Swap the model, the tools, or the retrieval context and the key changes:
key("p", "gpt-5") != key("p", "claude-sonnet-4-5") # True
API
| Function | Purpose |
|---|---|
key(prompt, model, *, tools=, retrieval_context=, system=, version="v1", length=16) |
The Pythonic short-key form. |
semantic_cache_key(request: dict) |
JS-compatible -- takes a single dict, returns the full 64-char hash. |
normalize_text(s) |
Lowercase + collapse whitespace + trim (the canonical-form primitive). |
stable_value(v) |
Recursively sort dict keys for deterministic JSON. |
See the JS sibling's README for the design notes and examples in cross-runtime caches.
1 maintainer
Metadata
1 maintainer
Release files for semantic-cache-key 0.1.0
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | Actions |
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| semantic_cache_key-0.1.0.tar.gz | 6.1 kB | Without provenance | Details for semantic_cache_key-0.1.0.tar.gz |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Actions Reset |
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| semantic_cache_key-0.1.0-py3-none-any.whl | Python 3 | none | any | Details for semantic_cache_key-0.1.0-py3-none-any.whl |
Total release size: 12.5 kB
Release files / semantic_cache_key-0.1.0.tar.gz
| Download URL | semantic_cache_key-0.1.0.tar.gz |
|---|---|
| Size | 6.1 kB |
| Tags | Source |
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SHA-256 checksum How to use checksums |
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twine/6.2.0 CPython/3.14.4
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Release files / semantic_cache_key-0.1.0-py3-none-any.whl
| Download URL | semantic_cache_key-0.1.0-py3-none-any.whl |
|---|---|
| Size | 6.4 kB |
| Tags | Python 3 |
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SHA-256 checksum How to use checksums |
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BLAKE2b-256 checksum How to use checksums |
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No |
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twine/6.2.0 CPython/3.14.4
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