a2a-source-edit: write agent.py
This commit is contained in:
a2a-cloud
516
agent.py
516
agent.py
@@ -1,189 +1,419 @@
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"""generates-svg-video-game-9jg9vd-f0f510 agent.
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Starter stack:
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- DeepAgents for tool-calling orchestration
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- Caller-provided LLM credentials via ctx.llm
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- A tiny model-call middleware hook you can replace with tracing,
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routing, rate limits, or policy checks
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"""
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"""A2A agent that generates SVG video game assets and persists execution receipts."""
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from __future__ import annotations
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import hashlib
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import html
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import json
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from pathlib import Path
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from typing import Any
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import os
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import re
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import uuid
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from contextlib import contextmanager
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from datetime import datetime, timezone
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from typing import Annotated, Any, Iterator, Literal
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from pydantic import BaseModel
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from pydantic import BaseModel, Field
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import a2a_pack as a2a
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from a2a_pack import (
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A2AAgent,
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LLMProvisioning,
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{{ auth_type }},
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AgentDatabase,
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AgentDatabaseEnv,
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AgentDatabaseMigrations,
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AgentPlatformResources,
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PlatformUserAuth,
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PlatformUserAuthResolver,
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Pricing,
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Resources,
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RunContext,
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WorkspaceAccess,
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WorkspaceMode,
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)
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from a2a_pack.context import LLMCreds
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ASSET_TYPES = ("character", "enemy", "item", "tile", "icon", "projectile")
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STYLES = ("pixel", "flat", "outline", "neon")
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DB_OPTIONS = "-c statement_timeout=5000 -c lock_timeout=2000 -c idle_in_transaction_session_timeout=10000"
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class GeneratesSvgVideoGame9jg9vdF0f510Config(BaseModel):
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pass
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default_size: int = Field(default=128, ge=32, le=512)
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SYSTEM_PROMPT = """\
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You are a compact tool-calling agent.
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Use the text_stats tool when the user asks about text, counts, summaries,
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or anything where exact length/word numbers would help. Mention tool results
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briefly instead of dumping raw JSON.
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"""
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RUNTIME_SKILLS_DIR = "generates-svg-video-game-9jg9vd-f0f510/.deepagents/skills/"
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DEEPAGENTS_RECURSION_LIMIT = 500
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class SvgAssetResult(BaseModel):
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status: Literal["ok", "validation_error"]
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receipt_id: str | None = None
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asset_id: str | None = None
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asset_type: str
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theme: str
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style: str
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size: int
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variant_count: int
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svg_assets: list[dict[str, str | int]]
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receipt_persisted: bool
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warnings: list[str] = Field(default_factory=list)
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class GeneratesSvgVideoGame9jg9vdF0f510(A2AAgent[GeneratesSvgVideoGame9jg9vdF0f510Config, {{ auth_type }}]):
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class ReceiptSummary(BaseModel):
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receipt_id: str
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asset_id: str
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asset_type: str
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theme: str
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style: str
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size: int
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variant_count: int
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created_at: str
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class ReceiptListResult(BaseModel):
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status: Literal["ok", "setup_required"]
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receipts: list[ReceiptSummary]
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warning: str | None = None
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class GeneratesSvgVideoGame9jg9vdF0f510(
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A2AAgent[GeneratesSvgVideoGame9jg9vdF0f510Config, PlatformUserAuth]
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):
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name = "generates-svg-video-game-9jg9vd-f0f510"
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description = "Generates SVG video game assets with a packed product UI and persisted execution receipts."
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description = "Generates bounded SVG video game assets and records production execution receipts."
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version = "0.1.0"
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config_model = GeneratesSvgVideoGame9jg9vdF0f510Config
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auth_model = {{ auth_type }}
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auth_model = PlatformUserAuth
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auth_resolver = PlatformUserAuthResolver()
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# Hosted generated agents read the caller's saved LLM credential through
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# ctx.llm. The platform may proxy that credential through LiteLLM, but agent
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# code never reads provider keys, LiteLLM master keys, or OPENAI_API_KEY
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# directly.
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llm_provisioning = LLMProvisioning.PLATFORM
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pricing = Pricing(
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price_per_call_usd=0.0,
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caller_pays_llm=True,
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notes="Starter agent uses the caller's saved LLM credential via ctx.llm.",
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caller_pays_llm=False,
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notes="Deterministic SVG generation; no LLM credential is required.",
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)
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workspace_access = WorkspaceAccess.dynamic(
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max_files=64,
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allowed_modes=(WorkspaceMode.READ_ONLY, WorkspaceMode.READ_WRITE_OVERLAY),
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require_reason=False,
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resources = Resources(cpu="500m", memory="512Mi", max_runtime_seconds=120)
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platform_resources = AgentPlatformResources(
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databases=(
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AgentDatabase(
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name="generates-svg-video-game-9jg9vd-f0f510-data",
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scope="user",
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access_mode="read_write",
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env=AgentDatabaseEnv(url="DATABASE_URL"),
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migrations=AgentDatabaseMigrations(path="db/migrations"),
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),
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)
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tools_used = ("deepagents", "langchain")
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)
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tools_used = ("svg", "postgres")
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@a2a.tool(description="Ask the starter DeepAgent to answer with tool calls when useful")
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async def ask(self, ctx: RunContext[{{ auth_type }}], prompt: str) -> str:
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creds = ctx.llm
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await ctx.emit_progress(f"llm: {creds.model} via {creds.source}")
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if not creds.api_key:
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return (
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"LLM key required. Add an LLM credential in Settings > LLM "
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"credentials before running this agent; for local --invoke "
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"runs set AGENT_LLM_KEY."
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@a2a.tool(
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description="Generate one to four SVG video game assets from a bounded typed prompt and persist an execution receipt.",
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timeout_seconds=120,
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idempotent=False,
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cost_class="media-light",
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)
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graph = self._build_deep_agent(ctx=ctx, creds=creds)
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state = await graph.ainvoke(
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{"messages": [{"role": "user", "content": prompt}]},
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config={"recursion_limit": DEEPAGENTS_RECURSION_LIMIT},
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)
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await ctx.emit_progress("deepagent finished")
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return _last_message_text(state)
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def _build_deep_agent(
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async def generate_svg_asset(
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self,
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*,
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ctx: RunContext[{{ auth_type }}],
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creds: LLMCreds,
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) -> Any:
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# Lazy imports keep `a2a card` usable before local dependencies are
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# installed. `a2a deploy` installs requirements.txt during the build.
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from a2a_pack.deepagents import create_a2a_deep_agent
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from langchain.agents.middleware import wrap_model_call
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from langchain_core.tools import tool
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ctx: RunContext[PlatformUserAuth],
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asset_type: Literal["character", "enemy", "item", "tile", "icon", "projectile"],
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theme: Annotated[str, Field(min_length=2, max_length=80)],
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palette: Annotated[list[str], Field(min_length=1, max_length=5)] = ("#7dd3fc", "#0f172a", "#facc15"),
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size: Annotated[int, Field(ge=32, le=512)] = 128,
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style: Literal["pixel", "flat", "outline", "neon"] = "pixel",
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variant_count: Annotated[int, Field(ge=1, le=4)] = 1,
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) -> SvgAssetResult:
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"""Create SVG game assets and save a DB receipt when production DB is configured."""
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tenant = _tenant_key(ctx)
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clean_theme = _clean_text(theme, max_len=80)
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colors = _normalize_palette(palette)
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if not clean_theme:
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return SvgAssetResult(
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status="validation_error",
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asset_type=asset_type,
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theme=theme,
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style=style,
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size=size,
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variant_count=variant_count,
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svg_assets=[],
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receipt_persisted=False,
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warnings=["theme must contain at least one visible character"],
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)
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@tool
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def text_stats(text: str) -> str:
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"""Return exact word, character, and line counts for text."""
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words = [part for part in text.split() if part.strip()]
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return json.dumps(
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await ctx.emit_progress(f"generating {variant_count} {style} {asset_type} asset(s)")
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seed_material = json.dumps(
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{
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"characters": len(text),
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"words": len(words),
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"lines": len(text.splitlines()) or 1,
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"tenant": tenant,
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"asset_type": asset_type,
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"theme": clean_theme,
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"palette": colors,
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"size": size,
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"style": style,
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"variant_count": variant_count,
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},
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sort_keys=True,
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)
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seed = hashlib.sha256(seed_material.encode("utf-8")).hexdigest()
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asset_id = f"asset_{seed[:16]}"
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receipt_id = f"rcpt_{uuid.uuid4().hex}"
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created_at = datetime.now(timezone.utc).isoformat()
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assets: list[dict[str, str | int]] = []
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for index in range(variant_count):
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svg = _render_svg(
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asset_type=asset_type,
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theme=clean_theme,
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palette=colors,
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size=size,
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style=style,
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variant=index,
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seed=seed,
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)
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assets.append(
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{
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"name": f"{_slugify(clean_theme)}-{asset_type}-{style}-{index + 1}.svg",
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"media_type": "image/svg+xml",
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"size": size,
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"svg": svg,
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}
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)
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@wrap_model_call
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async def log_model_call(request: Any, handler: Any) -> Any:
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messages = request.state.get("messages", [])
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print(
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"[middleware] model_call "
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f"model={creds.model} source={creds.source} messages={len(messages)}"
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warnings: list[str] = []
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persisted = False
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if os.environ.get("DATABASE_URL"):
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try:
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_persist_asset_and_receipt(
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tenant_key=tenant,
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receipt_id=receipt_id,
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asset_id=asset_id,
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request={
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"asset_type": asset_type,
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"theme": clean_theme,
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"palette": colors,
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"size": size,
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"style": style,
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"variant_count": variant_count,
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},
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result={"asset_count": len(assets), "asset_names": [a["name"] for a in assets]},
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created_at=created_at,
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)
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return await handler(request)
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persisted = True
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except Exception as exc: # noqa: BLE001
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warnings.append(f"receipt persistence unavailable: {type(exc).__name__}")
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else:
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warnings.append("DATABASE_URL not configured; receipt persistence skipped in this environment")
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backend = ctx.workspace_backend()
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skill_sources = _seed_runtime_skills(backend, ctx)
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# create_a2a_deep_agent resolves provider:model strings with
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# langchain.init_chat_model from ctx.llm, preserving LiteLLM routing,
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# provider-specific extra body, and runtime model overrides.
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return create_a2a_deep_agent(
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ctx,
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creds=creds,
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backend=backend,
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skills=skill_sources or None,
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tools=[text_stats],
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middleware=[log_model_call],
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system_prompt=SYSTEM_PROMPT,
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await ctx.emit_progress("svg asset generation complete")
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return SvgAssetResult(
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status="ok",
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receipt_id=receipt_id,
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asset_id=asset_id,
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asset_type=asset_type,
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theme=clean_theme,
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style=style,
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size=size,
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variant_count=variant_count,
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svg_assets=assets,
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receipt_persisted=persisted,
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warnings=warnings,
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)
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def _runtime_skills_root(ctx: RunContext[Any]) -> str:
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workspace = getattr(ctx, "_workspace", None)
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prefixes = tuple(getattr(workspace, "write_prefixes", ()) or ())
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if not prefixes:
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outputs_prefix = getattr(workspace, "outputs_prefix", None)
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prefixes = (outputs_prefix or "outputs/",)
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prefix = str(prefixes[0]).strip("/")
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return f"/{prefix}/{RUNTIME_SKILLS_DIR}" if prefix else f"/{RUNTIME_SKILLS_DIR}"
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@a2a.tool(
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description="List recent persisted SVG generation receipts for the signed-in platform user.",
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timeout_seconds=30,
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idempotent=True,
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cost_class="cheap",
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)
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async def list_recent_receipts(
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self,
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ctx: RunContext[PlatformUserAuth],
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limit: Annotated[int, Field(ge=1, le=25)] = 10,
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) -> ReceiptListResult:
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tenant = _tenant_key(ctx)
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if not os.environ.get("DATABASE_URL"):
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return ReceiptListResult(
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status="setup_required",
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receipts=[],
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warning="DATABASE_URL is not configured for this environment.",
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)
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rows = _load_recent_receipts(tenant, limit)
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return ReceiptListResult(status="ok", receipts=[ReceiptSummary(**row) for row in rows])
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def _seed_runtime_skills(backend: Any, ctx: RunContext[Any]) -> list[str]:
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"""Copy packaged DeepAgents skills into the invocation workspace.
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def _tenant_key(ctx: RunContext[PlatformUserAuth]) -> str:
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auth = ctx.auth
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stable_id = auth.user_id if auth.user_id is not None else auth.sub
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if not stable_id:
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raise PermissionError("stable platform identity required")
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return f"user:{stable_id}"
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DeepAgents loads skills from its backend, while source-controlled
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``skills/`` folders live in the image. This bridge lets generated agents
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ship reusable SKILL.md bundles without giving up durable A2A workspace
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files.
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@contextmanager
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def _db_connection() -> Iterator[Any]:
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import psycopg
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database_url = os.environ["DATABASE_URL"]
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with psycopg.connect(database_url, options=DB_OPTIONS) as conn:
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yield conn
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def _persist_asset_and_receipt(
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*,
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tenant_key: str,
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receipt_id: str,
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asset_id: str,
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request: dict[str, Any],
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result: dict[str, Any],
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created_at: str,
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) -> None:
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with _db_connection() as conn:
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with conn.transaction():
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conn.execute(
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"""
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root = Path(__file__).parent / "skills"
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if not root.exists():
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return []
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runtime_skills_root = _runtime_skills_root(ctx)
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uploads: list[tuple[str, bytes]] = []
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for path in root.rglob("*"):
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if path.is_file():
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rel = path.relative_to(root).as_posix()
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uploads.append((runtime_skills_root + rel, path.read_bytes()))
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if uploads:
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backend.upload_files(uploads)
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return [runtime_skills_root]
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return []
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INSERT INTO svg_asset_receipts
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(tenant_key, receipt_id, asset_id, asset_type, theme, style, size, variant_count, request_payload, result_payload, created_at)
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VALUES
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(%s, %s, %s, %s, %s, %s, %s, %s, %s::jsonb, %s::jsonb, %s)
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""",
|
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(
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tenant_key,
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receipt_id,
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asset_id,
|
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request["asset_type"],
|
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request["theme"],
|
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request["style"],
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request["size"],
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request["variant_count"],
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json.dumps(request, sort_keys=True),
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json.dumps(result, sort_keys=True),
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created_at,
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),
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)
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def _last_message_text(state: dict[str, Any]) -> str:
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messages = state.get("messages") or []
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if not messages:
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return json.dumps(state, default=str)
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def _load_recent_receipts(tenant_key: str, limit: int) -> list[dict[str, Any]]:
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with _db_connection() as conn:
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with conn.cursor() as cur:
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cur.execute(
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"""
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SELECT receipt_id, asset_id, asset_type, theme, style, size, variant_count, created_at
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FROM svg_asset_receipts
|
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WHERE tenant_key = %s
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ORDER BY created_at DESC
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LIMIT %s
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""",
|
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(tenant_key, limit),
|
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)
|
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rows = cur.fetchall()
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return [
|
||||
{
|
||||
"receipt_id": row[0],
|
||||
"asset_id": row[1],
|
||||
"asset_type": row[2],
|
||||
"theme": row[3],
|
||||
"style": row[4],
|
||||
"size": row[5],
|
||||
"variant_count": row[6],
|
||||
"created_at": row[7].isoformat() if hasattr(row[7], "isoformat") else str(row[7]),
|
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}
|
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for row in rows
|
||||
]
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||||
|
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content = getattr(messages[-1], "content", None)
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if isinstance(content, str):
|
||||
return content
|
||||
if isinstance(content, list):
|
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parts: list[str] = []
|
||||
for item in content:
|
||||
if isinstance(item, dict):
|
||||
text = item.get("text") or item.get("content")
|
||||
if text:
|
||||
parts.append(str(text))
|
||||
elif item:
|
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parts.append(str(item))
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return "\n".join(parts) if parts else json.dumps(content, default=str)
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return str(content or messages[-1])
|
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|
||||
def _normalize_palette(palette: list[str] | tuple[str, ...]) -> list[str]:
|
||||
out: list[str] = []
|
||||
for raw in palette:
|
||||
value = str(raw).strip()
|
||||
if not re.fullmatch(r"#[0-9a-fA-F]{6}", value):
|
||||
raise ValueError(f"invalid hex color: {value!r}")
|
||||
if value.lower() not in [item.lower() for item in out]:
|
||||
out.append(value)
|
||||
if not out:
|
||||
raise ValueError("palette must include at least one #RRGGBB color")
|
||||
return out[:5]
|
||||
|
||||
|
||||
def _clean_text(value: str, *, max_len: int) -> str:
|
||||
return re.sub(r"\s+", " ", str(value)).strip()[:max_len]
|
||||
|
||||
|
||||
def _slugify(value: str) -> str:
|
||||
slug = re.sub(r"[^a-z0-9]+", "-", value.lower()).strip("-")
|
||||
return slug or "game-asset"
|
||||
|
||||
|
||||
def _render_svg(
|
||||
*,
|
||||
asset_type: str,
|
||||
theme: str,
|
||||
palette: list[str],
|
||||
size: int,
|
||||
style: str,
|
||||
variant: int,
|
||||
seed: str,
|
||||
) -> str:
|
||||
bg = palette[(variant + 1) % len(palette)]
|
||||
primary = palette[variant % len(palette)]
|
||||
accent = palette[(variant + 2) % len(palette)]
|
||||
dark = "#0f172a"
|
||||
unit = size / 16
|
||||
stroke = max(2, int(size / 48))
|
||||
title = html.escape(f"{theme} {asset_type} {style} variant {variant + 1}")
|
||||
label = html.escape(theme[:18])
|
||||
pattern = int(seed[variant * 2 : variant * 2 + 2], 16)
|
||||
|
||||
def px(n: float) -> str:
|
||||
return f"{n * unit:.2f}"
|
||||
|
||||
bg_shape = (
|
||||
f'<rect width="{size}" height="{size}" rx="{size * 0.14:.1f}" fill="{bg}" opacity="0.18"/>'
|
||||
if style != "outline"
|
||||
else f'<rect x="{stroke}" y="{stroke}" width="{size - 2 * stroke}" height="{size - 2 * stroke}" rx="{size * 0.12:.1f}" fill="none" stroke="{primary}" stroke-width="{stroke}"/>'
|
||||
)
|
||||
glow = ""
|
||||
if style == "neon":
|
||||
glow = f'<filter id="glow"><feGaussianBlur stdDeviation="3" result="blur"/><feMerge><feMergeNode in="blur"/><feMergeNode in="SourceGraphic"/></feMerge></filter>'
|
||||
|
||||
body = _asset_body(asset_type, style, primary, accent, dark, stroke, px, pattern)
|
||||
grid = ""
|
||||
if style == "pixel":
|
||||
grid = "".join(
|
||||
f'<rect x="{px((pattern + i * 3) % 14 + 1)}" y="{px((pattern // 3 + i * 5) % 14 + 1)}" width="{px(1)}" height="{px(1)}" fill="{accent}" opacity="0.7"/>'
|
||||
for i in range(5)
|
||||
)
|
||||
|
||||
return (
|
||||
f'<svg xmlns="http://www.w3.org/2000/svg" role="img" viewBox="0 0 {size} {size}" width="{size}" height="{size}">'
|
||||
f'<title>{title}</title><defs>{glow}</defs>{bg_shape}'
|
||||
f'<g filter="{"url(#glow)" if style == "neon" else "none"}">{grid}{body}</g>'
|
||||
f'<text x="{size / 2:.1f}" y="{size - unit:.1f}" text-anchor="middle" font-family="monospace" font-size="{max(8, int(size / 13))}" fill="{dark}" opacity="0.78">{label}</text>'
|
||||
"</svg>"
|
||||
)
|
||||
|
||||
|
||||
def _asset_body(asset_type: str, style: str, primary: str, accent: str, dark: str, stroke: int, px: Any, pattern: int) -> str:
|
||||
fill = "none" if style == "outline" else primary
|
||||
common = f'stroke="{dark}" stroke-width="{stroke}" stroke-linejoin="round" stroke-linecap="round"'
|
||||
if asset_type == "character":
|
||||
return (
|
||||
f'<circle cx="{px(8)}" cy="{px(4.2)}" r="{px(2.1)}" fill="{fill}" {common}/>'
|
||||
f'<path d="M {px(5)} {px(7)} H {px(11)} L {px(12)} {px(13)} H {px(4)} Z" fill="{fill}" {common}/>'
|
||||
f'<circle cx="{px(7.25)}" cy="{px(4)}" r="{px(.35)}" fill="{accent}"/><circle cx="{px(8.75)}" cy="{px(4)}" r="{px(.35)}" fill="{accent}"/>'
|
||||
)
|
||||
if asset_type == "enemy":
|
||||
spikes = " ".join(f'{px(2 + i * 2)},{px(7 + ((pattern + i) % 3))}' for i in range(7))
|
||||
return (
|
||||
f'<polygon points="{px(8)},{px(2)} {px(14)},{px(8)} {px(11)},{px(14)} {px(5)},{px(14)} {px(2)},{px(8)}" fill="{fill}" {common}/>'
|
||||
f'<polyline points="{spikes}" fill="none" stroke="{accent}" stroke-width="{stroke}"/>'
|
||||
f'<circle cx="{px(6)}" cy="{px(8)}" r="{px(.55)}" fill="{dark}"/><circle cx="{px(10)}" cy="{px(8)}" r="{px(.55)}" fill="{dark}"/>'
|
||||
)
|
||||
if asset_type == "item":
|
||||
return (
|
||||
f'<path d="M {px(8)} {px(2)} L {px(13)} {px(7)} L {px(8)} {px(14)} L {px(3)} {px(7)} Z" fill="{fill}" {common}/>'
|
||||
f'<path d="M {px(8)} {px(3.7)} L {px(10.8)} {px(7)} L {px(8)} {px(12)} L {px(5.2)} {px(7)} Z" fill="{accent}" opacity="0.85"/>'
|
||||
)
|
||||
if asset_type == "tile":
|
||||
return "".join(
|
||||
f'<rect x="{px(x)}" y="{px(y)}" width="{px(3)}" height="{px(3)}" fill="{primary if (x + y + pattern) % 2 else accent}" {common} opacity="0.9"/>'
|
||||
for x in (2, 5, 8, 11)
|
||||
for y in (2, 5, 8, 11)
|
||||
)
|
||||
if asset_type == "projectile":
|
||||
return (
|
||||
f'<path d="M {px(2)} {px(9)} C {px(6)} {px(3)}, {px(10)} {px(3)}, {px(14)} {px(7)} C {px(10)} {px(8)}, {px(7)} {px(10)}, {px(2)} {px(9)} Z" fill="{fill}" {common}/>'
|
||||
f'<path d="M {px(3)} {px(9)} L {px(1)} {px(6)} M {px(3.4)} {px(9.5)} L {px(1)} {px(12)}" stroke="{accent}" stroke-width="{stroke}"/>'
|
||||
)
|
||||
return (
|
||||
f'<rect x="{px(4)}" y="{px(4)}" width="{px(8)}" height="{px(8)}" rx="{px(1.4)}" fill="{fill}" {common}/>'
|
||||
f'<path d="M {px(8)} {px(3)} V {px(13)} M {px(3)} {px(8)} H {px(13)}" stroke="{accent}" stroke-width="{stroke}"/>'
|
||||
)
|
||||
|
||||
Reference in New Issue
Block a user