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2026-06-03 23:24:34 +08:00

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Python

#!/usr/bin/env python3
"""
s07: Skill Loading — two-level on-demand knowledge injection.
Layer 1 (cheap, always present):
SYSTEM prompt includes skill names + one-line descriptions (~100 tokens/skill)
"Skills available: agent-builder, code-review, mcp-builder, pdf"
Layer 2 (expensive, on demand):
Agent calls load_skill("code-review") → full SKILL.md content
injected via tool_result (~2000 tokens/skill)
skills/
agent-builder/SKILL.md
code-review/SKILL.md
mcp-builder/SKILL.md
pdf/SKILL.md
Changes from s06:
+ build_system() — scan skills/ dir at startup, inject catalog into SYSTEM
+ load_skill(name) — return full SKILL.md content via tool_result
+ SKILLS_DIR config
Loop unchanged: load_skill auto-dispatches via TOOL_HANDLERS.
Run: python s07_skill_loading/code.py
Needs: pip install anthropic python-dotenv pyyaml + ANTHROPIC_API_KEY in .env
"""
import ast, json, os, subprocess
from pathlib import Path
import yaml
try:
import readline
readline.parse_and_bind('set bind-tty-special-chars off')
except ImportError:
pass
from anthropic import Anthropic
from dotenv import load_dotenv
load_dotenv(override=True)
if os.getenv("ANTHROPIC_BASE_URL"):
os.environ.pop("ANTHROPIC_AUTH_TOKEN", None)
WORKDIR = Path.cwd()
SKILLS_DIR = WORKDIR / "skills"
client = Anthropic(base_url=os.getenv("ANTHROPIC_BASE_URL"))
MODEL = os.environ["MODEL_ID"]
CURRENT_TODOS: list[dict] = []
# s07: Skill catalog scan (used by build_system below)
def _parse_frontmatter(text: str) -> tuple[dict, str]:
"""Parse YAML frontmatter from SKILL.md. Returns (meta, body)."""
if not text.startswith("---"):
return {}, text
parts = text.split("---", 2)
if len(parts) < 3:
return {}, text
try:
meta = yaml.safe_load(parts[1]) or {}
except yaml.YAMLError:
meta = {}
return meta, parts[2].strip()
# Build skill registry at startup (used for safe lookup in load_skill)
SKILL_REGISTRY: dict[str, dict] = {}
def _scan_skills():
"""Scan skills/ dir, populate SKILL_REGISTRY with name/description/content."""
if not SKILLS_DIR.exists():
return
for d in sorted(SKILLS_DIR.iterdir()):
if not d.is_dir():
continue
manifest = d / "SKILL.md"
if manifest.exists():
raw = manifest.read_text()
meta, body = _parse_frontmatter(raw)
name = meta.get("name", d.name)
desc = meta.get("description", raw.split("\n")[0].lstrip("#").strip())
SKILL_REGISTRY[name] = {"name": name, "description": desc, "content": raw}
_scan_skills()
def list_skills() -> str:
"""List all skills (name + one-line description)."""
if not SKILL_REGISTRY:
return "(no skills found)"
return "\n".join(f"- **{s['name']}**: {s['description']}" for s in SKILL_REGISTRY.values())
# s07: SYSTEM includes skill catalog (cheap — just names + descriptions)
def build_system() -> str:
"""Build SYSTEM prompt with skill catalog injected at startup."""
catalog = list_skills()
return (
f"You are a coding agent at {WORKDIR}. "
f"Skills available:\n{catalog}\n"
"Use load_skill to get full details when needed."
)
SYSTEM = build_system()
# s07: subagent gets its own system prompt — no skill loading, no task
SUB_SYSTEM = (
f"You are a coding agent at {WORKDIR}. "
"Complete the task you were given, then return a concise summary. "
"Do not delegate further."
)
# ═══════════════════════════════════════════════════════════
# FROM s02-s06 (unchanged): Tool Implementations
# ═══════════════════════════════════════════════════════════
def safe_path(p: str) -> Path:
path = (WORKDIR / p).resolve()
if not path.is_relative_to(WORKDIR):
raise ValueError(f"Path escapes workspace: {p}")
return path
def run_bash(command: str) -> str:
try:
r = subprocess.run(command, shell=True, cwd=WORKDIR,
capture_output=True, text=True, timeout=120)
out = (r.stdout + r.stderr).strip()
return out[:50000] if out else "(no output)"
except subprocess.TimeoutExpired:
return "Error: Timeout (120s)"
def run_read(path: str, limit: int | None = None) -> str:
try:
lines = safe_path(path).read_text().splitlines()
if limit and limit < len(lines):
lines = lines[:limit] + [f"... ({len(lines) - limit} more lines)"]
return "\n".join(lines)
except Exception as e:
return f"Error: {e}"
def run_write(path: str, content: str) -> str:
try:
file_path = safe_path(path)
file_path.parent.mkdir(parents=True, exist_ok=True)
file_path.write_text(content)
return f"Wrote {len(content)} bytes to {path}"
except Exception as e:
return f"Error: {e}"
def run_edit(path: str, old_text: str, new_text: str) -> str:
try:
file_path = safe_path(path)
text = file_path.read_text()
if old_text not in text:
return f"Error: text not found in {path}"
file_path.write_text(text.replace(old_text, new_text, 1))
return f"Edited {path}"
except Exception as e:
return f"Error: {e}"
def run_glob(pattern: str) -> str:
import glob as g
try:
results = []
for match in g.glob(pattern, root_dir=WORKDIR):
if (WORKDIR / match).resolve().is_relative_to(WORKDIR):
results.append(match)
return "\n".join(results) if results else "(no matches)"
except Exception as e:
return f"Error: {e}"
def _normalize_todos(todos):
if isinstance(todos, str):
try:
todos = json.loads(todos)
except json.JSONDecodeError:
try:
todos = ast.literal_eval(todos)
except (SyntaxError, ValueError):
return None, "Error: todos must be a list or JSON array string"
if not isinstance(todos, list):
return None, "Error: todos must be a list"
for i, t in enumerate(todos):
if not isinstance(t, dict):
return None, f"Error: todos[{i}] must be an object"
if "content" not in t or "status" not in t:
return None, f"Error: todos[{i}] missing 'content' or 'status'"
if t["status"] not in ("pending", "in_progress", "completed"):
return None, f"Error: todos[{i}] has invalid status '{t['status']}'"
return todos, None
def run_todo_write(todos: list) -> str:
global CURRENT_TODOS
todos, error = _normalize_todos(todos)
if error:
return error
CURRENT_TODOS = todos
lines = ["\n\033[33m## Current Tasks\033[0m"]
for t in CURRENT_TODOS:
icon = {"pending": " ", "in_progress": "\033[36m▸\033[0m", "completed": "\033[32m✓\033[0m"}[t["status"]]
lines.append(f" [{icon}] {t['content']}")
print("\n".join(lines))
return f"Updated {len(CURRENT_TODOS)} tasks"
def extract_text(content) -> str:
if not isinstance(content, list):
return str(content)
return "\n".join(getattr(b, "text", "") for b in content if getattr(b, "type", None) == "text")
# ═══════════════════════════════════════════════════════════
# FROM s06 (unchanged): Subagent
# ═══════════════════════════════════════════════════════════
SUB_TOOLS = [
{"name": "bash", "description": "Run a shell command.",
"input_schema": {"type": "object", "properties": {"command": {"type": "string"}}, "required": ["command"]}},
{"name": "read_file", "description": "Read file contents.",
"input_schema": {"type": "object", "properties": {"path": {"type": "string"}}, "required": ["path"]}},
{"name": "write_file", "description": "Write content to a file.",
"input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "content": {"type": "string"}}, "required": ["path", "content"]}},
{"name": "edit_file", "description": "Replace exact text in a file once.",
"input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "old_text": {"type": "string"}, "new_text": {"type": "string"}}, "required": ["path", "old_text", "new_text"]}},
{"name": "glob", "description": "Find files matching a glob pattern.",
"input_schema": {"type": "object", "properties": {"pattern": {"type": "string"}}, "required": ["pattern"]}},
]
SUB_HANDLERS = {"bash": run_bash, "read_file": run_read, "write_file": run_write,
"edit_file": run_edit, "glob": run_glob}
def spawn_subagent(description: str) -> str:
print(f"\n\033[35m[Subagent spawned]\033[0m")
messages = [{"role": "user", "content": description}]
for _ in range(30):
response = client.messages.create(model=MODEL, system=SUB_SYSTEM,
messages=messages, tools=SUB_TOOLS, max_tokens=8000)
messages.append({"role": "assistant", "content": response.content})
if response.stop_reason != "tool_use":
break
results = []
for block in response.content:
if block.type == "tool_use":
blocked = trigger_hooks("PreToolUse", block)
if blocked:
results.append({"type": "tool_result", "tool_use_id": block.id,
"content": str(blocked)})
continue
handler = SUB_HANDLERS.get(block.name)
output = handler(**block.input) if handler else f"Unknown: {block.name}"
trigger_hooks("PostToolUse", block, output)
print(f" \033[90m[sub] {block.name}: {str(output)[:100]}\033[0m")
results.append({"type": "tool_result", "tool_use_id": block.id, "content": output})
messages.append({"role": "user", "content": results})
result = extract_text(messages[-1]["content"])
if not result:
for msg in reversed(messages):
if msg["role"] == "assistant":
result = extract_text(msg["content"])
if result:
break
if not result:
result = "Subagent stopped after 30 turns without final answer."
print(f"\033[35m[Subagent done]\033[0m")
return result
# ═══════════════════════════════════════════════════════════
# NEW in s07: load_skill — runtime full content loading
# ═══════════════════════════════════════════════════════════
def load_skill(name: str) -> str:
"""Load full skill content. Lookup via registry — no path traversal."""
skill = SKILL_REGISTRY.get(name)
if not skill:
return f"Skill not found: {name}"
return skill["content"]
# ═══════════════════════════════════════════════════════════
# Tool Registry — all tools from s02-s07
# ═══════════════════════════════════════════════════════════
TOOLS = [
{"name": "bash", "description": "Run a shell command.",
"input_schema": {"type": "object", "properties": {"command": {"type": "string"}}, "required": ["command"]}},
{"name": "read_file", "description": "Read file contents.",
"input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "limit": {"type": "integer"}}, "required": ["path"]}},
{"name": "write_file", "description": "Write content to a file.",
"input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "content": {"type": "string"}}, "required": ["path", "content"]}},
{"name": "edit_file", "description": "Replace exact text in a file once.",
"input_schema": {"type": "object", "properties": {"path": {"type": "string"}, "old_text": {"type": "string"}, "new_text": {"type": "string"}}, "required": ["path", "old_text", "new_text"]}},
{"name": "glob", "description": "Find files matching a glob pattern.",
"input_schema": {"type": "object", "properties": {"pattern": {"type": "string"}}, "required": ["pattern"]}},
{"name": "todo_write", "description": "Create and manage a task list for your current coding session.",
"input_schema": {"type": "object", "properties": {"todos": {"type": "array", "items": {"type": "object", "properties": {"content": {"type": "string"}, "status": {"type": "string", "enum": ["pending", "in_progress", "completed"]}}, "required": ["content", "status"]}}}, "required": ["todos"]}},
{"name": "task", "description": "Launch a subagent to handle a complex subtask. Returns only the final conclusion.",
"input_schema": {"type": "object", "properties": {"description": {"type": "string"}}, "required": ["description"]}},
# s07: skill tool (catalog is already in SYSTEM prompt, this loads full content)
{"name": "load_skill", "description": "Load the full content of a skill by name.",
"input_schema": {"type": "object", "properties": {"name": {"type": "string"}}, "required": ["name"]}},
]
TOOL_HANDLERS = {
"bash": run_bash, "read_file": run_read, "write_file": run_write,
"edit_file": run_edit, "glob": run_glob, "todo_write": run_todo_write,
"task": spawn_subagent, "load_skill": load_skill,
}
# ═══════════════════════════════════════════════════════════
# FROM s04 (unchanged): Hook System
# ═══════════════════════════════════════════════════════════
HOOKS = {"UserPromptSubmit": [], "PreToolUse": [], "PostToolUse": [], "Stop": []}
def register_hook(event: str, callback):
HOOKS[event].append(callback)
def trigger_hooks(event: str, *args):
for callback in HOOKS[event]:
result = callback(*args)
if result is not None:
return result
return None
DENY_LIST = ["rm -rf /", "sudo", "shutdown", "reboot", "mkfs", "dd if="]
def permission_hook(block):
if block.name == "bash":
for p in DENY_LIST:
if p in block.input.get("command", ""):
print(f"\n\033[31m⛔ Blocked: '{p}'\033[0m")
return "Permission denied"
return None
def log_hook(block):
print(f"\033[90m[HOOK] {block.name}\033[0m")
return None
def context_inject_hook(query: str):
print(f"\033[90m[HOOK] UserPromptSubmit: working in {WORKDIR}\033[0m")
return None
def summary_hook(messages: list):
tool_count = sum(1 for m in messages
for b in (m.get("content") if isinstance(m.get("content"), list) else [])
if isinstance(b, dict) and b.get("type") == "tool_result")
print(f"\033[90m[HOOK] Stop: session used {tool_count} tool calls\033[0m")
return None
register_hook("UserPromptSubmit", context_inject_hook)
register_hook("PreToolUse", permission_hook)
register_hook("PreToolUse", log_hook)
register_hook("Stop", summary_hook)
# ═══════════════════════════════════════════════════════════
# agent_loop — same as s05-s06 + nag reminder
# ═══════════════════════════════════════════════════════════
rounds_since_todo = 0
def agent_loop(messages: list):
global rounds_since_todo
while True:
if rounds_since_todo >= 3 and messages:
messages.append({"role": "user",
"content": "<reminder>Update your todos.</reminder>"})
rounds_since_todo = 0
response = client.messages.create(
model=MODEL, system=SYSTEM, messages=messages,
tools=TOOLS, max_tokens=8000,
)
messages.append({"role": "assistant", "content": response.content})
if response.stop_reason != "tool_use":
force = trigger_hooks("Stop", messages)
if force:
messages.append({"role": "user", "content": force})
continue
return
rounds_since_todo += 1
results = []
for block in response.content:
if block.type != "tool_use":
continue
blocked = trigger_hooks("PreToolUse", block)
if blocked:
results.append({"type": "tool_result", "tool_use_id": block.id,
"content": str(blocked)})
continue
handler = TOOL_HANDLERS.get(block.name)
output = handler(**block.input) if handler else f"Unknown: {block.name}"
trigger_hooks("PostToolUse", block, output)
if block.name == "todo_write":
rounds_since_todo = 0
results.append({"type": "tool_result", "tool_use_id": block.id,
"content": output})
messages.append({"role": "user", "content": results})
if __name__ == "__main__":
print("s07: Skill Loading — catalog in SYSTEM, content on demand")
print("Type a question, press Enter. Type q to quit.\n")
history = []
while True:
try:
query = input("\033[36ms07 >> \033[0m")
except (EOFError, KeyboardInterrupt):
break
if query.strip().lower() in ("q", "exit", ""):
break
trigger_hooks("UserPromptSubmit", query)
history.append({"role": "user", "content": query})
agent_loop(history)
for block in history[-1]["content"]:
if getattr(block, "type", None) == "text":
print(block.text)
print()