hermes-agent/tools/skill_manager_tool.py

#!/usr/bin/env python3
"""
Skill Manager Tool -- Agent-Managed Skill Creation & Editing

Allows the agent to create, update, and delete skills, turning successful
approaches into reusable procedural knowledge. New skills are created in
~/.hermes/skills/. Existing skills (bundled, hub-installed, or user-created)
can be modified or deleted wherever they live.

Skills are the agent's procedural memory: they capture *how to do a specific
type of task* based on proven experience. General memory (MEMORY.md, USER.md) is
broad and declarative. Skills are narrow and actionable.

Actions:
  create     -- Create a new skill (SKILL.md + directory structure)
  edit       -- Replace the SKILL.md content of a user skill (full rewrite)
  patch      -- Targeted find-and-replace within SKILL.md or any supporting file
  delete     -- Remove a user skill entirely
  write_file -- Add/overwrite a supporting file (reference, template, script, asset)
  remove_file-- Remove a supporting file from a user skill

Directory layout for user skills:
    ~/.hermes/skills/
    ├── my-skill/
    │   ├── SKILL.md
    │   ├── references/
    │   ├── templates/
    │   ├── scripts/
    │   └── assets/
    └── category-name/
        └── another-skill/
            └── SKILL.md
"""

import json
import logging
import os
import re
import shutil
import tempfile
from pathlib import Path
from hermes_constants import get_hermes_home, display_hermes_home
from typing import Dict, Any, Optional, Tuple

logger = logging.getLogger(__name__)

# Import security scanner — external hub installs always get scanned;
# agent-created skills only get scanned when skills.guard_agent_created is on.
try:
    from tools.skills_guard import scan_skill, should_allow_install, format_scan_report
    _GUARD_AVAILABLE = True
except ImportError:
    _GUARD_AVAILABLE = False


def _guard_agent_created_enabled() -> bool:
    """Read skills.guard_agent_created from config (default False).

    Off by default because the agent can already execute the same code
    paths via terminal() with no gate, so the scan adds friction without
    meaningful security.  Users who want belt-and-suspenders can turn it
    on via `hermes config set skills.guard_agent_created true`.
    """
    try:
        from hermes_cli.config import load_config
        cfg = load_config()
        return bool(cfg.get("skills", {}).get("guard_agent_created", False))
    except Exception:
        return False


def _security_scan_skill(skill_dir: Path) -> Optional[str]:
    """Scan a skill directory after write. Returns error string if blocked, else None.

    No-op when skills.guard_agent_created is disabled (the default).
    """
    if not _GUARD_AVAILABLE:
        return None
    if not _guard_agent_created_enabled():
        return None
    try:
        result = scan_skill(skill_dir, source="agent-created")
        allowed, reason = should_allow_install(result)
        if allowed is False:
            report = format_scan_report(result)
            return f"Security scan blocked this skill ({reason}):\n{report}"
        if allowed is None:
            # "ask" verdict — for agent-created skills this means dangerous
            # findings were detected.  Surface specific findings so the agent
            # knows exactly what to fix and can retry.
            findings_detail = "\n".join(
                f"  - {f.file}:{f.line}: {f.description} (matched: {f.match!r})"
                for f in result.findings
            )
            logger.warning(
                "Agent-created skill flagged for review (dangerous findings): %s",
                reason,
            )
            return (
                f"Security scan flagged this skill — please fix the following issues and retry:\n"
                f"{findings_detail}\n"
                f"Remove or rewrite the flagged content, then try creating the skill again."
            )
    except Exception as e:
        logger.warning("Security scan failed for %s: %s", skill_dir, e, exc_info=True)
    return None

import yaml


# All skills live in ~/.hermes/skills/ (single source of truth)
HERMES_HOME = get_hermes_home()
SKILLS_DIR = HERMES_HOME / "skills"

MAX_NAME_LENGTH = 64
MAX_DESCRIPTION_LENGTH = 1024


def _is_local_skill(skill_path: Path) -> bool:
    """Check if a skill path is within the local SKILLS_DIR.

    Skills found in external_dirs are read-only from the agent's perspective.
    """
    try:
        skill_path.resolve().relative_to(SKILLS_DIR.resolve())
        return True
    except ValueError:
        return False
MAX_SKILL_CONTENT_CHARS = 100_000   # ~36k tokens at 2.75 chars/token
MAX_SKILL_FILE_BYTES = 1_048_576    # 1 MiB per supporting file

# Characters allowed in skill names (filesystem-safe, URL-friendly)
VALID_NAME_RE = re.compile(r'^[a-z0-9][a-z0-9._-]*$')

# Subdirectories allowed for write_file/remove_file
ALLOWED_SUBDIRS = {"references", "templates", "scripts", "assets"}


# =============================================================================
# Validation helpers
# =============================================================================

def _validate_name(name: str) -> Optional[str]:
    """Validate a skill name. Returns error message or None if valid."""
    if not name:
        return "Skill name is required."
    if len(name) > MAX_NAME_LENGTH:
        return f"Skill name exceeds {MAX_NAME_LENGTH} characters."
    if not VALID_NAME_RE.match(name):
        return (
            f"Invalid skill name '{name}'. Use lowercase letters, numbers, "
            f"hyphens, dots, and underscores. Must start with a letter or digit."
        )
    return None


def _validate_category(category: Optional[str]) -> Optional[str]:
    """Validate an optional category name used as a single directory segment."""
    if category is None:
        return None
    if not isinstance(category, str):
        return "Category must be a string."

    category = category.strip()
    if not category:
        return None
    if "/" in category or "\\" in category:
        return (
            f"Invalid category '{category}'. Use lowercase letters, numbers, "
            "hyphens, dots, and underscores. Categories must be a single directory name."
        )
    if len(category) > MAX_NAME_LENGTH:
        return f"Category exceeds {MAX_NAME_LENGTH} characters."
    if not VALID_NAME_RE.match(category):
        return (
            f"Invalid category '{category}'. Use lowercase letters, numbers, "
            "hyphens, dots, and underscores. Categories must be a single directory name."
        )
    return None


def _validate_frontmatter(content: str) -> Optional[str]:
    """
    Validate that SKILL.md content has proper frontmatter with required fields.
    Returns error message or None if valid.
    """
    if not content.strip():
        return "Content cannot be empty."

    if not content.startswith("---"):
        return "SKILL.md must start with YAML frontmatter (---). See existing skills for format."

    end_match = re.search(r'\n---\s*\n', content[3:])
    if not end_match:
        return "SKILL.md frontmatter is not closed. Ensure you have a closing '---' line."

    yaml_content = content[3:end_match.start() + 3]

    try:
        parsed = yaml.safe_load(yaml_content)
    except yaml.YAMLError as e:
        return f"YAML frontmatter parse error: {e}"

    if not isinstance(parsed, dict):
        return "Frontmatter must be a YAML mapping (key: value pairs)."

    if "name" not in parsed:
        return "Frontmatter must include 'name' field."
    if "description" not in parsed:
        return "Frontmatter must include 'description' field."
    if len(str(parsed["description"])) > MAX_DESCRIPTION_LENGTH:
        return f"Description exceeds {MAX_DESCRIPTION_LENGTH} characters."

    body = content[end_match.end() + 3:].strip()
    if not body:
        return "SKILL.md must have content after the frontmatter (instructions, procedures, etc.)."

    return None


def _validate_content_size(content: str, label: str = "SKILL.md") -> Optional[str]:
    """Check that content doesn't exceed the character limit for agent writes.

    Returns an error message or None if within bounds.
    """
    if len(content) > MAX_SKILL_CONTENT_CHARS:
        return (
            f"{label} content is {len(content):,} characters "
            f"(limit: {MAX_SKILL_CONTENT_CHARS:,}). "
            f"Consider splitting into a smaller SKILL.md with supporting files "
            f"in references/ or templates/."
        )
    return None


def _resolve_skill_dir(name: str, category: str = None) -> Path:
    """Build the directory path for a new skill, optionally under a category."""
    if category:
        return SKILLS_DIR / category / name
    return SKILLS_DIR / name


def _find_skill(name: str) -> Optional[Dict[str, Any]]:
    """
    Find a skill by name across all skill directories.

    Searches the local skills dir (~/.hermes/skills/) first, then any
    external dirs configured via skills.external_dirs.  Returns
    {"path": Path} or None.
    """
    from agent.skill_utils import get_all_skills_dirs
    for skills_dir in get_all_skills_dirs():
        if not skills_dir.exists():
            continue
        for skill_md in skills_dir.rglob("SKILL.md"):
            if skill_md.parent.name == name:
                return {"path": skill_md.parent}
    return None


def _validate_file_path(file_path: str) -> Optional[str]:
    """
    Validate a file path for write_file/remove_file.
    Must be under an allowed subdirectory and not escape the skill dir.
    """
    from tools.path_security import has_traversal_component

    if not file_path:
        return "file_path is required."

    normalized = Path(file_path)

    # Prevent path traversal
    if has_traversal_component(file_path):
        return "Path traversal ('..') is not allowed."

    # Must be under an allowed subdirectory
    if not normalized.parts or normalized.parts[0] not in ALLOWED_SUBDIRS:
        allowed = ", ".join(sorted(ALLOWED_SUBDIRS))
        return f"File must be under one of: {allowed}. Got: '{file_path}'"

    # Must have a filename (not just a directory)
    if len(normalized.parts) < 2:
        return f"Provide a file path, not just a directory. Example: '{normalized.parts[0]}/myfile.md'"

    return None


def _resolve_skill_target(skill_dir: Path, file_path: str) -> Tuple[Optional[Path], Optional[str]]:
    """Resolve a supporting-file path and ensure it stays within the skill directory."""
    from tools.path_security import validate_within_dir

    target = skill_dir / file_path
    error = validate_within_dir(target, skill_dir)
    if error:
        return None, error
    return target, None


def _atomic_write_text(file_path: Path, content: str, encoding: str = "utf-8") -> None:
    """
    Atomically write text content to a file.
    
    Uses a temporary file in the same directory and os.replace() to ensure
    the target file is never left in a partially-written state if the process
    crashes or is interrupted.
    
    Args:
        file_path: Target file path
        content: Content to write
        encoding: Text encoding (default: utf-8)
    """
    file_path.parent.mkdir(parents=True, exist_ok=True)
    fd, temp_path = tempfile.mkstemp(
        dir=str(file_path.parent),
        prefix=f".{file_path.name}.tmp.",
        suffix="",
    )
    try:
        with os.fdopen(fd, "w", encoding=encoding) as f:
            f.write(content)
        os.replace(temp_path, file_path)
    except Exception:
        # Clean up temp file on error
        try:
            os.unlink(temp_path)
        except OSError:
            logger.error("Failed to remove temporary file %s during atomic write", temp_path, exc_info=True)
        raise


# =============================================================================
# Core actions
# =============================================================================

def _create_skill(name: str, content: str, category: str = None) -> Dict[str, Any]:
    """Create a new user skill with SKILL.md content."""
    # Validate name
    err = _validate_name(name)
    if err:
        return {"success": False, "error": err}

    err = _validate_category(category)
    if err:
        return {"success": False, "error": err}

    # Validate content
    err = _validate_frontmatter(content)
    if err:
        return {"success": False, "error": err}

    err = _validate_content_size(content)
    if err:
        return {"success": False, "error": err}

    # Check for name collisions across all directories
    existing = _find_skill(name)
    if existing:
        return {
            "success": False,
            "error": f"A skill named '{name}' already exists at {existing['path']}."
        }

    # Create the skill directory
    skill_dir = _resolve_skill_dir(name, category)
    skill_dir.mkdir(parents=True, exist_ok=True)

    # Write SKILL.md atomically
    skill_md = skill_dir / "SKILL.md"
    _atomic_write_text(skill_md, content)

    # Security scan — roll back on block
    scan_error = _security_scan_skill(skill_dir)
    if scan_error:
        shutil.rmtree(skill_dir, ignore_errors=True)
        return {"success": False, "error": scan_error}

    result = {
        "success": True,
        "message": f"Skill '{name}' created.",
        "path": str(skill_dir.relative_to(SKILLS_DIR)),
        "skill_md": str(skill_md),
    }
    if category:
        result["category"] = category
    result["hint"] = (
        "To add reference files, templates, or scripts, use "
        "skill_manage(action='write_file', name='{}', file_path='references/example.md', file_content='...')".format(name)
    )
    return result


def _edit_skill(name: str, content: str) -> Dict[str, Any]:
    """Replace the SKILL.md of any existing skill (full rewrite)."""
    err = _validate_frontmatter(content)
    if err:
        return {"success": False, "error": err}

    err = _validate_content_size(content)
    if err:
        return {"success": False, "error": err}

    existing = _find_skill(name)
    if not existing:
        return {"success": False, "error": f"Skill '{name}' not found. Use skills_list() to see available skills."}

    if not _is_local_skill(existing["path"]):
        return {"success": False, "error": f"Skill '{name}' is in an external directory and cannot be modified. Copy it to your local skills directory first."}

    skill_md = existing["path"] / "SKILL.md"
    # Back up original content for rollback
    original_content = skill_md.read_text(encoding="utf-8") if skill_md.exists() else None
    _atomic_write_text(skill_md, content)

    # Security scan — roll back on block
    scan_error = _security_scan_skill(existing["path"])
    if scan_error:
        if original_content is not None:
            _atomic_write_text(skill_md, original_content)
        return {"success": False, "error": scan_error}

    return {
        "success": True,
        "message": f"Skill '{name}' updated.",
        "path": str(existing["path"]),
    }


def _patch_skill(
    name: str,
    old_string: str,
    new_string: str,
    file_path: str = None,
    replace_all: bool = False,
) -> Dict[str, Any]:
    """Targeted find-and-replace within a skill file.

    Defaults to SKILL.md. Use file_path to patch a supporting file instead.
    Requires a unique match unless replace_all is True.
    """
    if not old_string:
        return {"success": False, "error": "old_string is required for 'patch'."}
    if new_string is None:
        return {"success": False, "error": "new_string is required for 'patch'. Use an empty string to delete matched text."}

    existing = _find_skill(name)
    if not existing:
        return {"success": False, "error": f"Skill '{name}' not found."}

    if not _is_local_skill(existing["path"]):
        return {"success": False, "error": f"Skill '{name}' is in an external directory and cannot be modified. Copy it to your local skills directory first."}

    skill_dir = existing["path"]

    if file_path:
        # Patching a supporting file
        err = _validate_file_path(file_path)
        if err:
            return {"success": False, "error": err}
        target, err = _resolve_skill_target(skill_dir, file_path)
        if err:
            return {"success": False, "error": err}
    else:
        # Patching SKILL.md
        target = skill_dir / "SKILL.md"

    if not target.exists():
        return {"success": False, "error": f"File not found: {target.relative_to(skill_dir)}"}

    content = target.read_text(encoding="utf-8")

    # Use the same fuzzy matching engine as the file patch tool.
    # This handles whitespace normalization, indentation differences,
    # escape sequences, and block-anchor matching — saving the agent
    # from exact-match failures on minor formatting mismatches.
    from tools.fuzzy_match import fuzzy_find_and_replace

    new_content, match_count, _strategy, match_error = fuzzy_find_and_replace(
        content, old_string, new_string, replace_all
    )
    if match_error:
        # Show a short preview of the file so the model can self-correct
        preview = content[:500] + ("..." if len(content) > 500 else "")
        err_msg = match_error
        try:
            from tools.fuzzy_match import format_no_match_hint
            err_msg += format_no_match_hint(match_error, match_count, old_string, content)
        except Exception:
            pass
        return {
            "success": False,
            "error": err_msg,
            "file_preview": preview,
        }

    # Check size limit on the result
    target_label = "SKILL.md" if not file_path else file_path
    err = _validate_content_size(new_content, label=target_label)
    if err:
        return {"success": False, "error": err}

    # If patching SKILL.md, validate frontmatter is still intact
    if not file_path:
        err = _validate_frontmatter(new_content)
        if err:
            return {
                "success": False,
                "error": f"Patch would break SKILL.md structure: {err}",
            }

    original_content = content  # for rollback
    _atomic_write_text(target, new_content)

    # Security scan — roll back on block
    scan_error = _security_scan_skill(skill_dir)
    if scan_error:
        _atomic_write_text(target, original_content)
        return {"success": False, "error": scan_error}

    return {
        "success": True,
        "message": f"Patched {'SKILL.md' if not file_path else file_path} in skill '{name}' ({match_count} replacement{'s' if match_count > 1 else ''}).",
    }


def _delete_skill(name: str) -> Dict[str, Any]:
    """Delete a skill."""
    existing = _find_skill(name)
    if not existing:
        return {"success": False, "error": f"Skill '{name}' not found."}

    if not _is_local_skill(existing["path"]):
        return {"success": False, "error": f"Skill '{name}' is in an external directory and cannot be deleted."}

    skill_dir = existing["path"]
    shutil.rmtree(skill_dir)

    # Clean up empty category directories (don't remove SKILLS_DIR itself)
    parent = skill_dir.parent
    if parent != SKILLS_DIR and parent.exists() and not any(parent.iterdir()):
        parent.rmdir()

    return {
        "success": True,
        "message": f"Skill '{name}' deleted.",
    }


def _write_file(name: str, file_path: str, file_content: str) -> Dict[str, Any]:
    """Add or overwrite a supporting file within any skill directory."""
    err = _validate_file_path(file_path)
    if err:
        return {"success": False, "error": err}

    if not file_content and file_content != "":
        return {"success": False, "error": "file_content is required."}

    # Check size limits
    content_bytes = len(file_content.encode("utf-8"))
    if content_bytes > MAX_SKILL_FILE_BYTES:
        return {
            "success": False,
            "error": (
                f"File content is {content_bytes:,} bytes "
                f"(limit: {MAX_SKILL_FILE_BYTES:,} bytes / 1 MiB). "
                f"Consider splitting into smaller files."
            ),
        }
    err = _validate_content_size(file_content, label=file_path)
    if err:
        return {"success": False, "error": err}

    existing = _find_skill(name)
    if not existing:
        return {"success": False, "error": f"Skill '{name}' not found. Create it first with action='create'."}

    if not _is_local_skill(existing["path"]):
        return {"success": False, "error": f"Skill '{name}' is in an external directory and cannot be modified. Copy it to your local skills directory first."}

    target, err = _resolve_skill_target(existing["path"], file_path)
    if err:
        return {"success": False, "error": err}
    target.parent.mkdir(parents=True, exist_ok=True)
    # Back up for rollback
    original_content = target.read_text(encoding="utf-8") if target.exists() else None
    _atomic_write_text(target, file_content)

    # Security scan — roll back on block
    scan_error = _security_scan_skill(existing["path"])
    if scan_error:
        if original_content is not None:
            _atomic_write_text(target, original_content)
        else:
            target.unlink(missing_ok=True)
        return {"success": False, "error": scan_error}

    return {
        "success": True,
        "message": f"File '{file_path}' written to skill '{name}'.",
        "path": str(target),
    }


def _remove_file(name: str, file_path: str) -> Dict[str, Any]:
    """Remove a supporting file from any skill directory."""
    err = _validate_file_path(file_path)
    if err:
        return {"success": False, "error": err}

    existing = _find_skill(name)
    if not existing:
        return {"success": False, "error": f"Skill '{name}' not found."}

    if not _is_local_skill(existing["path"]):
        return {"success": False, "error": f"Skill '{name}' is in an external directory and cannot be modified."}

    skill_dir = existing["path"]

    target, err = _resolve_skill_target(skill_dir, file_path)
    if err:
        return {"success": False, "error": err}
    if not target.exists():
        # List what's actually there for the model to see
        available = []
        for subdir in ALLOWED_SUBDIRS:
            d = skill_dir / subdir
            if d.exists():
                for f in d.rglob("*"):
                    if f.is_file():
                        available.append(str(f.relative_to(skill_dir)))
        return {
            "success": False,
            "error": f"File '{file_path}' not found in skill '{name}'.",
            "available_files": available if available else None,
        }

    target.unlink()

    # Clean up empty subdirectories
    parent = target.parent
    if parent != skill_dir and parent.exists() and not any(parent.iterdir()):
        parent.rmdir()

    return {
        "success": True,
        "message": f"File '{file_path}' removed from skill '{name}'.",
    }


# =============================================================================
# Main entry point
# =============================================================================

def skill_manage(
    action: str,
    name: str,
    content: str = None,
    category: str = None,
    file_path: str = None,
    file_content: str = None,
    old_string: str = None,
    new_string: str = None,
    replace_all: bool = False,
) -> str:
    """
    Manage user-created skills. Dispatches to the appropriate action handler.

    Returns JSON string with results.
    """
    if action == "create":
        if not content:
            return tool_error("content is required for 'create'. Provide the full SKILL.md text (frontmatter + body).", success=False)
        result = _create_skill(name, content, category)

    elif action == "edit":
        if not content:
            return tool_error("content is required for 'edit'. Provide the full updated SKILL.md text.", success=False)
        result = _edit_skill(name, content)

    elif action == "patch":
        if not old_string:
            return tool_error("old_string is required for 'patch'. Provide the text to find.", success=False)
        if new_string is None:
            return tool_error("new_string is required for 'patch'. Use empty string to delete matched text.", success=False)
        result = _patch_skill(name, old_string, new_string, file_path, replace_all)

    elif action == "delete":
        result = _delete_skill(name)

    elif action == "write_file":
        if not file_path:
            return tool_error("file_path is required for 'write_file'. Example: 'references/api-guide.md'", success=False)
        if file_content is None:
            return tool_error("file_content is required for 'write_file'.", success=False)
        result = _write_file(name, file_path, file_content)

    elif action == "remove_file":
        if not file_path:
            return tool_error("file_path is required for 'remove_file'.", success=False)
        result = _remove_file(name, file_path)

    else:
        result = {"success": False, "error": f"Unknown action '{action}'. Use: create, edit, patch, delete, write_file, remove_file"}

    if result.get("success"):
        try:
            from agent.prompt_builder import clear_skills_system_prompt_cache
            clear_skills_system_prompt_cache(clear_snapshot=True)
        except Exception:
            pass

    return json.dumps(result, ensure_ascii=False)


# =============================================================================
# OpenAI Function-Calling Schema
# =============================================================================

SKILL_MANAGE_SCHEMA = {
    "name": "skill_manage",
    "description": (
        "Manage skills (create, update, delete). Skills are your procedural "
        "memory — reusable approaches for recurring task types. "
        f"New skills go to {display_hermes_home()}/skills/; existing skills can be modified wherever they live.\n\n"
        "Actions: create (full SKILL.md + optional category), "
        "patch (old_string/new_string — preferred for fixes), "
        "edit (full SKILL.md rewrite — major overhauls only), "
        "delete, write_file, remove_file.\n\n"
        "Create when: complex task succeeded (5+ calls), errors overcome, "
        "user-corrected approach worked, non-trivial workflow discovered, "
        "or user asks you to remember a procedure.\n"
        "Update when: instructions stale/wrong, OS-specific failures, "
        "missing steps or pitfalls found during use. "
        "If you used a skill and hit issues not covered by it, patch it immediately.\n\n"
        "After difficult/iterative tasks, offer to save as a skill. "
        "Skip for simple one-offs. Confirm with user before creating/deleting.\n\n"
        "Good skills: trigger conditions, numbered steps with exact commands, "
        "pitfalls section, verification steps. Use skill_view() to see format examples."
    ),
    "parameters": {
        "type": "object",
        "properties": {
            "action": {
                "type": "string",
                "enum": ["create", "patch", "edit", "delete", "write_file", "remove_file"],
                "description": "The action to perform."
            },
            "name": {
                "type": "string",
                "description": (
                    "Skill name (lowercase, hyphens/underscores, max 64 chars). "
                    "Must match an existing skill for patch/edit/delete/write_file/remove_file."
                )
            },
            "content": {
                "type": "string",
                "description": (
                    "Full SKILL.md content (YAML frontmatter + markdown body). "
                    "Required for 'create' and 'edit'. For 'edit', read the skill "
                    "first with skill_view() and provide the complete updated text."
                )
            },
            "old_string": {
                "type": "string",
                "description": (
                    "Text to find in the file (required for 'patch'). Must be unique "
                    "unless replace_all=true. Include enough surrounding context to "
                    "ensure uniqueness."
                )
            },
            "new_string": {
                "type": "string",
                "description": (
                    "Replacement text (required for 'patch'). Can be empty string "
                    "to delete the matched text."
                )
            },
            "replace_all": {
                "type": "boolean",
                "description": "For 'patch': replace all occurrences instead of requiring a unique match (default: false)."
            },
            "category": {
                "type": "string",
                "description": (
                    "Optional category/domain for organizing the skill (e.g., 'devops', "
                    "'data-science', 'mlops'). Creates a subdirectory grouping. "
                    "Only used with 'create'."
                )
            },
            "file_path": {
                "type": "string",
                "description": (
                    "Path to a supporting file within the skill directory. "
                    "For 'write_file'/'remove_file': required, must be under references/, "
                    "templates/, scripts/, or assets/. "
                    "For 'patch': optional, defaults to SKILL.md if omitted."
                )
            },
            "file_content": {
                "type": "string",
                "description": "Content for the file. Required for 'write_file'."
            },
        },
        "required": ["action", "name"],
    },
}


# --- Registry ---
from tools.registry import registry, tool_error

registry.register(
    name="skill_manage",
    toolset="skills",
    schema=SKILL_MANAGE_SCHEMA,
    handler=lambda args, **kw: skill_manage(
        action=args.get("action", ""),
        name=args.get("name", ""),
        content=args.get("content"),
        category=args.get("category"),
        file_path=args.get("file_path"),
        file_content=args.get("file_content"),
        old_string=args.get("old_string"),
        new_string=args.get("new_string"),
        replace_all=args.get("replace_all", False)),
    emoji="📝",
)