Analyses Snapshot Testing

What it does

When your agent uses it

• Working with protocol analysis snapshots
• Adding protocols
• Updating snapshots
• Running snapshot tests

Example prompts

• “Use the analyses-snapshot-testing skill to convention for the analyses snapshot testing framework in analyses-snapshot-testing/”
• “/analyses-snapshot-testing”

Requirements

• Python 3
• Node.js
• Docker

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

1. 1Protocol Files (files/protocols/) — testing protocols organized by source (standard, Protocol Designer exports, Protocol Library imports…
2. 2Analysis Engine (automation/analyze.py) — runs protocol analysis in subprocess, 120-second timeout, JSON output
3. 3Snapshot Storage (tests/snapshots/) — committed JSON snapshots managed by syrupy with custom JSON extension
4. 4Test Suite (tests/) — analyses_snapshot_test.py (main), audit_snapshot_test.py (audit), custom_json_snapshot_extension.py (serialization)
5. 5Audit (automation/audit_snapshots.py) — validates snapshots: Flex_S protocols must have zero errors; Flex_X and other failure-case…
6. 6Protocol Registry (automation/data/) — protocols.py (auto-generated), protocols_with_overrides.py (manual), protocol_registry.py (combined)
7. 7CI/CD (citools/, .github/workflows/) — matrix-based parallel execution via Docker

What it can do on your machine

Read from SKILL.md and the folder at commit a14fef9. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Shell commands in SKILL.md call:

  • make
  • uv

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md. Its commands use uv, which can reach the network depending on how they are called.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Analyses Snapshot Testing loads about 1.7k tokens when it runs. Until then it costs about 57 tokens; SKILL.md has 522 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~57

When it runs · the whole SKILL.md, loaded when a task matches

~1.7k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Opentrons/opentrons at commit a14fef9, republished under its Apache-2.0 licence (© Opentrons). 522 words, ~1,681 tokens.

name

analyses-snapshot-testing

description

Conventions for the analyses snapshot testing framework in analyses-snapshot-testing/. Use when working with protocol analysis snapshots, adding protocols, updating snapshots, or running snapshot tests.

{Robot}_{Status}_{Version}_{Source}_{Pipettes}_{Modules}_{Overrides}\_{Description}

make snapshot-test-update                                          # All
make snapshot-test-update PROTOCOL_NAMES="P1,P2" OVERRIDE_PROTOCOL_NAMES=none  # Specific

make snapshot-test                                                   # All (reduced verbosity)
make snapshot-test PROTOCOL_NAMES=Flex_S_v2_19_Example OVERRIDE_PROTOCOL_NAMES=none  # Specific
uv run python -m pytest -k analyses_snapshot_test -vv --tb=short    # Verbose debugging

cd analyses-snapshot-testing
make setup    # Creates uv venv and installs dependencies

# Setup
make setup                    # Initial environment setup
make teardown                 # Remove virtual environment

# Testing
make snapshot-test            # Run all snapshot tests
make snapshot-test-update     # Update all snapshots
make snapshot-audit-test      # Validate snapshot audit metadata
make ot2-compatibility-test # Standalone OT-2 rejection test (not in snapshot battery)
make snapshot-validation    # snapshot-audit-test + ot2-compatibility-test

# Protocol Management
make prep                     # Regenerate protocol registry
make generate-protocols       # Generate override protocols

# Formatting
make format                   # Format Python + Markdown
make ruff                     # Format and lint Python

# CI Simulation
make gen-chunks               # Generate protocol chunks
make analyze-chunk CHUNK=chunk_0.json  # Analyze specific chunk

© Opentrons, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .cursor/skills/analyses-snapshot-testing of Opentrons/opentrons.

Open the folder on GitHubat commit a14fef9