afterimage

name	afterimage
description	name: afterimage-agent-guide Use when this capability is needed.

---

name: afterimage-agent-guide description: >- Uses the installed AfterImage PyPI package and its CLI in the user's own project to generate synthetic multi-turn datasets, grounded conversations, DPO pairs, exports, and analytics—not to hack the upstream library repo. Use when the user pip-installed afterimage, mentions ConversationGenerator, YAML configs, personas, SmartKeyPool, afterimage generate/export, or afterimage.altai.dev.

AfterImage — consumer agent guide

Assume the agent works in the user's application or data pipeline directory, with afterimage installed (pip install afterimage / uv add afterimage). Do not assume a checkout of github.com/altaidevorg/afterimage unless the user explicitly says they are developing the library.

AfterImage is a Python 3.11+ library and a Click CLI entry point named afterimage. It simulates a correspondent (user side) and respondent (assistant side), optionally grounded on documents, then writes JSONL (default) or SQL storage.

Authoritative sources for consumers:

• https://afterimage.altai.dev — main documentation
• https://afterimage.altai.dev/llms.txt — install, links, and examples oriented to agents
• https://afterimage.altai.dev/api/index.html — API reference (matches the published package)
• https://pypi.org/project/afterimage — version, extras, metadata
• Optional: clone the GitHub repo only when the user needs upstream examples (examples/) or is contributing patches

Anti-hallucination rule: Prefer the Sphinx API pages and help(...) / inspect.signature(...) on the installed package over random snippets from blogs or third-party posts. If a detail must be exact (export names, YAML keys), use the runtime checks in reference.md or the tables there, which are keyed by public module paths (afterimage.*), not paths on disk in a monorepo.

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Mental model

1. Respondent = model you want to imitate in training data (respondent_prompt / YAML respondent.system_prompt).
2. Correspondent = model that plays the user; driven by a correspondent system prompt and/or an instruction generator callback that emits first user turns and metadata (context, persona).
3. Each dialog samples an integer turn count uniformly from 1 through max_turns (see ConversationGenerator.generate in the API docs / docstring).
4. CLI builds a ConversationGenerator from validated YAML; when there are no documents or context.enabled is false, it uses SimpleInstructionGeneratorCallback internally (same behavior as documented under configuration → generation in the official docs).

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Installation

pip install afterimage
# optional extras (see PyPI “Optional extras” or llms.txt for current names):
pip install "afterimage[embeddings-local]"
pip install "afterimage[server]"
pip install "afterimage[training]"

Console scripts: afterimage (CLI). afterimage-server requires the server extra.

Pin versions in the user’s project (requirements.txt / pyproject.toml) if reproducibility matters.

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CLI workflow (no Python)

Use paths in the user’s project (not paths inside a library clone):

export GEMINI_API_KEY=your_key
afterimage validate -c ./configs/basic.yaml
afterimage generate -c ./configs/basic.yaml
afterimage generate -c ./configs/basic.yaml --dry-run
afterimage export -i ./output/dataset.jsonl -f sharegpt -f messages --split 0.9
afterimage export --list-formats
afterimage analyze -i ./output/dataset.jsonl -o ./reports/dataset.html
afterimage preference -c ./configs/preference.yaml

Starter YAML shapes appear in the official docs and in the upstream repo’s examples/configs/ on GitHub if the user wants a template to copy into ./configs/.

generation in YAML must provide a stop signal: either num_dialogs or at least one generation.stopping rule (see configuration reference on afterimage.altai.dev).

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Python API — minimal valid generator

ConversationGenerator requires at least one of correspondent_prompt or instruction_generator_callback. generate() requires an instruction callback on the constructor in current best practice; passing it only to generate() is deprecated.

Minimal pattern (no documents): SimpleInstructionGeneratorCallback.

import asyncio
import os

from afterimage import ConversationGenerator
from afterimage.callbacks import SimpleInstructionGeneratorCallback

async def main() -> None:
    api_key = os.environ["GEMINI_API_KEY"]
    instruction_cb = SimpleInstructionGeneratorCallback(
        api_key=api_key,
        model_name="gemini-2.5-flash",
        model_provider_name="gemini",
        n_instructions=3,
    )
    gen = ConversationGenerator(
        respondent_prompt="You are a helpful assistant. Be concise.",
        api_key=api_key,
        model_name="gemini-2.5-flash",
        model_provider_name="gemini",
        instruction_generator_callback=instruction_cb,
    )
    await gen.generate(num_dialogs=20, max_turns=4, max_concurrency=4)
    rows = gen.load_conversations()
    print(f"saved rows: {len(rows)}")

asyncio.run(main())

---

Python API — document + persona grounding

1. Build a DocumentProvider (e.g. InMemoryDocumentProvider(list[str])) or JSONLDocumentProvider / DirectoryDocumentProvider from afterimage.providers.
2. Optional: await PersonaGenerator(...).generate_from_documents(docs) — mutates document objects in place with personas.
3. Pass PersonaInstructionGeneratorCallback (or ContextualInstructionGeneratorCallback) as instruction_generator_callback.
4. For respondent answers conditioned on the same context string, set respondent_prompt_modifier=WithContextRespondentPromptModifier() (exported from top-level afterimage).

import asyncio
import os

from afterimage import (
    ConversationGenerator,
    InMemoryDocumentProvider,
    PersonaGenerator,
    PersonaInstructionGeneratorCallback,
    WithContextRespondentPromptModifier,
)

DOCUMENTS = [
    "Espresso is brewed under pressure and is the base for milk drinks.",
    "A pour-over uses a filter; control grind and pour rate for extraction.",
]

async def main() -> None:
    api_key = os.environ["GEMINI_API_KEY"]
    docs = InMemoryDocumentProvider(DOCUMENTS)

    persona_gen = PersonaGenerator(api_key=api_key, model_name="gemini-2.5-flash")
    await persona_gen.generate_from_documents(docs)

    instruction_cb = PersonaInstructionGeneratorCallback(
        api_key=api_key,
        documents=docs,
        model_name="gemini-2.5-flash",
        num_random_contexts=1,
        n_instructions=3,
    )

    gen = ConversationGenerator(
        respondent_prompt="You are a coffee educator. Ground answers in the provided context.",
        api_key=api_key,
        model_name="gemini-2.5-flash",
        instruction_generator_callback=instruction_cb,
        respondent_prompt_modifier=WithContextRespondentPromptModifier(),
    )
    await gen.generate(num_dialogs=50, max_turns=3, max_concurrency=5)

asyncio.run(main())

---

API keys at scale

SmartKeyPool (from afterimage import SmartKeyPool or afterimage.key_management) accepts api_keys: list[str], optional hourly_limit, daily_limit, error_threshold, cooldown_period. ConversationGenerator accepts api_key: str | SmartKeyPool and wraps a bare string with SmartKeyPool.from_single_key.

---

DPO / preference pairs

Use afterimage.preference.generator.PreferenceGenerator with a configured ConversationGenerator and ConversationJudge.

ConversationJudge is constructed with an LLMProvider and an EmbeddingProvider (or use ConversationJudge.from_factory(...) with key_pool and default_embedding_provider_config — same pattern the afterimage preference CLI uses).

from afterimage.preference.types import PreferenceConfig

pref = gen.to_preference_generator(
    judge=judge,
    config=PreferenceConfig(num_pairs=100, output_path="./out/prefs.jsonl"),
)
pairs, analytics = await pref.generate()
pref.save_pairs(pairs, analytics)
await judge.aclose()

Full judge wiring example: reference.md.

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Quality gate (auto_improve)

With ConversationGenerator(..., auto_improve=True), a judge is created automatically. For model_provider_name="local", local embeddings may be required; the package raises a clear ValueError suggesting pip install "afterimage[embeddings-local]" when needed.

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Name alias

AsyncConversationGenerator is the same class as ConversationGenerator (re-export). Prefer ConversationGenerator in new code.

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Best practices (consumers)

• Validate before spend: afterimage validate -c ... or afterimage generate ... --dry-run.
• Match provider keys: model_provider_name / YAML model.provider must be one of gemini, openai, deepseek, local, openrouter (afterimage.types.MODEL_PROVIDER_NAMES).
• Instruction callback on the constructor: avoids deprecation warnings and matches CLI behavior.
• Stable output path: pass JSONLStorage(conversations_path=...) into ConversationGenerator when you cannot rely on default timestamped files.
• YAML documents.provider: supported values for the CLI are those documented for configs (see official docs). For in-memory text corpora in Python, use InMemoryDocumentProvider; do not assume a YAML memory provider exists unless the docs for your installed version say so.

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Finding implementation details without a repo checkout

Goal	What to run or open
Installed version	python -c "import afterimage; print(afterimage.__version__)"
Package location	python -c "import afterimage, inspect; print(inspect.getfile(afterimage))"
CLI help	afterimage --help, afterimage generate --help, …
Symbol signatures	help(afterimage.ConversationGenerator), inspect.signature(...)
Export IDs for this install	python -c "from afterimage.integrations import list_formats; print([x['name'] for x in list_formats()])"
Deep reference	reference.md

For contributors maintaining upstream AfterImage, use the GitHub repository and DESIGN.md; that workflow is out of scope for this skill.

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Source: altaidevorg/afterimage — distributed by TomeVault.