docs(plugins): close the gaps \u2014 image-gen-provider-plugin guide + publishing a skill tap (#20800)

Two pluggable surfaces were mentioned in the interfaces map without a
real authoring guide behind them:

1. **Image-gen backends** — only had 'See bundled examples' pointers.
   Now a full developer-guide/image-gen-provider-plugin.md (270 lines)
   mirroring the memory/context/model provider docs:
   - How discovery works, directory structure, plugin.yaml
   - ImageGenProvider ABC with every overridable method
     (name, display_name, is_available, list_models, default_model,
     get_setup_schema, generate)
   - Full authoring walkthrough with a working MyBackendImageGenProvider
   - Response-format reference (success_response / error_response)
   - Handling b64 vs URL output (save_b64_image helper)
   - User overrides at ~/.hermes/plugins/image_gen/<name>/
   - Testing recipe + pip distribution
   - Reference examples (openai, openai-codex, xai)

2. **Skill taps** — features/skills.md mentioned the CLI commands but
   never explained the repo contract for publishing a tap. Added
   'Publishing a custom skill tap' section under Skills Hub covering:
   - Repo layout (skills/<name>/SKILL.md by default)
   - Minimal working example
   - Non-default path configuration (taps.json)
   - Installing individual skills without subscribing
   - Trust-level handling
   - Full tap management CLI + in-session /skills tap commands

Wired into:
- website/sidebars.ts: image-gen-provider-plugin added to Extending group
- website/docs/user-guide/features/plugins.md: pluggable interfaces
  table + 'What plugins can do' table now link to the real guides
  instead of 'See bundled examples'
- website/docs/guides/build-a-hermes-plugin.md: top info map and
  inline sub-sections updated, 'Full guide:' line added to
  image-gen block, tap section mentions publishing

Verified: docusaurus build SUCCESS, new page renders at
/docs/developer-guide/image-gen-provider-plugin, anchor
#publishing-a-custom-skill-tap resolves from plugins.md +
build-a-hermes-plugin.md. Pre-existing zh-Hans broken links unchanged.
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@ -0,0 +1,288 @@
---
sidebar_position: 11
title: "Image Generation Provider Plugins"
description: "How to build an image-generation backend plugin for Hermes Agent"
---
# Building an Image Generation Provider Plugin
Image-gen provider plugins register a backend that services every `image_generate` tool call — DALL·E, gpt-image, Grok, Flux, Imagen, Stable Diffusion, fal, Replicate, a local ComfyUI rig, anything. Built-in providers (OpenAI, OpenAI-Codex, xAI) all ship as plugins. You can add a new one, or override a bundled one, by dropping a directory into `plugins/image_gen/<name>/`.
:::tip
Image-gen is one of several **backend plugins** Hermes supports. The others (with more specialized ABCs) are [Memory Provider Plugins](/docs/developer-guide/memory-provider-plugin), [Context Engine Plugins](/docs/developer-guide/context-engine-plugin), and [Model Provider Plugins](/docs/developer-guide/model-provider-plugin). General tool/hook/CLI plugins live in [Build a Hermes Plugin](/docs/guides/build-a-hermes-plugin).
:::
## How discovery works
Hermes scans for image-gen backends in three places:
1. **Bundled**`<repo>/plugins/image_gen/<name>/` (auto-loaded with `kind: backend`, always available)
2. **User**`~/.hermes/plugins/image_gen/<name>/` (opt-in via `plugins.enabled`)
3. **Pip** — packages declaring a `hermes_agent.plugins` entry point
Each plugin's `register(ctx)` function calls `ctx.register_image_gen_provider(...)` — that puts it into the registry in `agent/image_gen_registry.py`. The active provider is picked by `image_gen.provider` in `config.yaml`; `hermes tools` walks users through selection.
The `image_generate` tool wrapper asks the registry for the active provider and dispatches there. If no provider is registered, the tool surfaces a helpful error pointing at `hermes tools`.
## Directory structure
```
plugins/image_gen/my-backend/
├── __init__.py # ImageGenProvider subclass + register()
└── plugin.yaml # Manifest with kind: backend
```
A bundled plugin is complete at this point. User plugins at `~/.hermes/plugins/image_gen/<name>/` need to be added to `plugins.enabled` in `config.yaml` (or run `hermes plugins enable <name>`).
## The ImageGenProvider ABC
Subclass `agent.image_gen_provider.ImageGenProvider`. The only required members are the `name` property and the `generate()` method — everything else has sane defaults:
```python
# plugins/image_gen/my-backend/__init__.py
from typing import Any, Dict, List, Optional
import os
from agent.image_gen_provider import (
DEFAULT_ASPECT_RATIO,
ImageGenProvider,
error_response,
resolve_aspect_ratio,
save_b64_image,
success_response,
)
class MyBackendImageGenProvider(ImageGenProvider):
@property
def name(self) -> str:
# Stable id used in image_gen.provider config. Lowercase, no spaces.
return "my-backend"
@property
def display_name(self) -> str:
# Human label shown in `hermes tools`. Defaults to name.title() if omitted.
return "My Backend"
def is_available(self) -> bool:
# Return False if credentials or deps are missing.
# The tool's availability gate calls this before dispatch.
if not os.environ.get("MY_BACKEND_API_KEY"):
return False
try:
import my_backend_sdk # noqa: F401
except ImportError:
return False
return True
def list_models(self) -> List[Dict[str, Any]]:
# Catalog shown in `hermes tools` model picker.
return [
{
"id": "my-model-fast",
"display": "My Model (Fast)",
"speed": "~5s",
"strengths": "Quick iteration",
"price": "$0.01/image",
},
{
"id": "my-model-hq",
"display": "My Model (HQ)",
"speed": "~30s",
"strengths": "Highest fidelity",
"price": "$0.04/image",
},
]
def default_model(self) -> Optional[str]:
return "my-model-fast"
def get_setup_schema(self) -> Dict[str, Any]:
# Metadata for the `hermes tools` picker — keys to prompt for at setup.
return {
"name": "My Backend",
"badge": "paid", # optional; shown as a short tag in the picker
"tag": "One-line description shown under the name",
"env_vars": [
{
"key": "MY_BACKEND_API_KEY",
"prompt": "My Backend API key",
"url": "https://my-backend.example.com/api-keys",
},
],
}
def generate(
self,
prompt: str,
aspect_ratio: str = DEFAULT_ASPECT_RATIO,
**kwargs: Any,
) -> Dict[str, Any]:
prompt = (prompt or "").strip()
aspect_ratio = resolve_aspect_ratio(aspect_ratio)
if not prompt:
return error_response(
error="Prompt is required",
error_type="invalid_input",
provider=self.name,
prompt="",
aspect_ratio=aspect_ratio,
)
# Model selection precedence: env var → config → default. The helper
# _resolve_model() in the built-in openai plugin is a good reference.
model_id = kwargs.get("model") or self.default_model() or "my-model-fast"
try:
import my_backend_sdk
client = my_backend_sdk.Client(api_key=os.environ["MY_BACKEND_API_KEY"])
result = client.generate(
prompt=prompt,
model=model_id,
aspect_ratio=aspect_ratio,
)
# Two shapes supported:
# - URL string: return it as `image`
# - base64 data: save under $HERMES_HOME/cache/images/ via save_b64_image()
if result.get("image_b64"):
path = save_b64_image(
result["image_b64"],
prefix=self.name,
extension="png",
)
image = str(path)
else:
image = result["image_url"]
return success_response(
image=image,
model=model_id,
prompt=prompt,
aspect_ratio=aspect_ratio,
provider=self.name,
)
except Exception as exc:
return error_response(
error=str(exc),
error_type=type(exc).__name__,
provider=self.name,
model=model_id,
prompt=prompt,
aspect_ratio=aspect_ratio,
)
def register(ctx) -> None:
"""Plugin entry point — called once at load time."""
ctx.register_image_gen_provider(MyBackendImageGenProvider())
```
## plugin.yaml
```yaml
name: my-backend
version: 1.0.0
description: My image backend — text-to-image via My Backend SDK
author: Your Name
kind: backend
requires_env:
- MY_BACKEND_API_KEY
```
`kind: backend` is what routes the plugin to the image-gen registration path. `requires_env` is prompted during `hermes plugins install`.
## ABC reference
Full contract in `agent/image_gen_provider.py`. The methods you'll typically override:
| Member | Required | Default | Purpose |
|---|---|---|---|
| `name` | ✅ | — | Stable id used in `image_gen.provider` config |
| `display_name` | — | `name.title()` | Label shown in `hermes tools` |
| `is_available()` | — | `True` | Gate for missing creds/deps |
| `list_models()` | — | `[]` | Catalog for `hermes tools` model picker |
| `default_model()` | — | first from `list_models()` | Fallback when no model is configured |
| `get_setup_schema()` | — | minimal | Picker metadata + env-var prompts |
| `generate(prompt, aspect_ratio, **kwargs)` | ✅ | — | The call |
## Response format
`generate()` must return a dict built via `success_response()` or `error_response()`. Both live in `agent/image_gen_provider.py`.
**Success:**
```python
success_response(
image=<url-or-absolute-path>,
model=<model-id>,
prompt=<echoed-prompt>,
aspect_ratio="landscape" | "square" | "portrait",
provider=<your-provider-name>,
extra={...}, # optional backend-specific fields
)
```
**Error:**
```python
error_response(
error="human-readable message",
error_type="provider_error" | "invalid_input" | "<exception class name>",
provider=<your-provider-name>,
model=<model-id>,
prompt=<prompt>,
aspect_ratio=<resolved aspect>,
)
```
The tool wrapper JSON-serializes the dict and hands it to the LLM. Errors are surfaced as the tool result; the LLM decides how to explain them to the user.
## Handling base64 vs URL output
Some backends return image URLs (fal, Replicate); others return base64 payloads (OpenAI gpt-image-2). For the base64 case, use `save_b64_image()` — it writes to `$HERMES_HOME/cache/images/<prefix>_<timestamp>_<uuid>.<ext>` and returns the absolute `Path`. Pass that path (as `str`) as `image=` in `success_response()`. Gateway delivery (Telegram photo bubble, Discord attachment) recognizes both URLs and absolute paths.
## User overrides
Drop a user plugin at `~/.hermes/plugins/image_gen/<name>/` with the same `name` property as a bundled one and enable it via `hermes plugins enable <name>` — the registry is last-writer-wins, so your version replaces the built-in. Useful for pointing an `openai` plugin at a private proxy, or swapping in a custom model catalog.
## Testing
```bash
export HERMES_HOME=/tmp/hermes-imggen-test
mkdir -p $HERMES_HOME/plugins/image_gen/my-backend
# …copy __init__.py + plugin.yaml into that dir…
export MY_BACKEND_API_KEY=your-test-key
hermes plugins enable my-backend
# Pick it as the active provider
echo "image_gen:" >> $HERMES_HOME/config.yaml
echo " provider: my-backend" >> $HERMES_HOME/config.yaml
# Exercise it
hermes -z "Generate an image of a corgi in a spacesuit"
```
Or interactively: `hermes tools` → "Image Generation" → select `my-backend` → enter API key if prompted.
## Reference implementations
- **`plugins/image_gen/openai/__init__.py`** — gpt-image-2 at low/medium/high tiers as three virtual model IDs sharing one API model with different `quality` params. Good example of tiered models under a single backend + config.yaml precedence chain.
- **`plugins/image_gen/xai/__init__.py`** — Grok Imagine via xAI. Different shape (URL output, simpler catalog).
- **`plugins/image_gen/openai-codex/__init__.py`** — Codex-style Responses API variant reusing the OpenAI SDK with a different routing base URL.
## Distribute via pip
```toml
# pyproject.toml
[project.entry-points."hermes_agent.plugins"]
my-backend-imggen = "my_backend_imggen_package"
```
`my_backend_imggen_package` must expose a top-level `register` function. See [Distribute via pip](/docs/guides/build-a-hermes-plugin#distribute-via-pip) in the general plugin guide for the full setup.
## Related pages
- [Image Generation](/docs/user-guide/features/image-generation) — user-facing feature documentation
- [Plugins overview](/docs/user-guide/features/plugins) — all plugin types at a glance
- [Build a Hermes Plugin](/docs/guides/build-a-hermes-plugin) — general tools/hooks/slash commands guide

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@ -19,13 +19,13 @@ Hermes has several distinct pluggable interfaces — some use Python `register_*
| A **gateway channel** (Discord/Telegram/IRC/Teams/etc.) | [Adding Platform Adapters](/docs/developer-guide/adding-platform-adapters) |
| A **memory backend** (Honcho/Mem0/Supermemory/etc.) | [Memory Provider Plugins](/docs/developer-guide/memory-provider-plugin) |
| A **context-compression engine** | [Context Engine Plugins](/docs/developer-guide/context-engine-plugin) |
| An **image-generation backend** | See bundled examples in `plugins/image_gen/openai/` and `plugins/image_gen/xai/` |
| An **image-generation backend** | [Image Generation Provider Plugins](/docs/developer-guide/image-gen-provider-plugin) |
| A **TTS backend** (any CLI — Piper, VoxCPM, Kokoro, voice cloning, …) | [TTS custom command providers](/docs/user-guide/features/tts#custom-command-providers) — config-driven, no Python needed |
| An **STT backend** (custom whisper / ASR CLI) | [Voice Message Transcription](/docs/user-guide/features/tts#voice-message-transcription-stt) — set `HERMES_LOCAL_STT_COMMAND` to a shell template |
| **External tools via MCP** (filesystem, GitHub, Linear, any MCP server) | [MCP](/docs/user-guide/features/mcp) — declare `mcp_servers.<name>` in `config.yaml` |
| **Gateway event hooks** (fire on startup, session events, commands) | [Event Hooks](/docs/user-guide/features/hooks#gateway-event-hooks) — drop `HOOK.yaml` + `handler.py` into `~/.hermes/hooks/<name>/` |
| **Shell hooks** (run a shell command on events) | [Shell Hooks](/docs/user-guide/features/hooks#shell-hooks) — declare under `hooks:` in `config.yaml` |
| **Additional skill sources** (custom GitHub repos, private skill indexes) | [Skills](/docs/user-guide/features/skills) — `hermes skills tap add <repo>` |
| **Additional skill sources** (custom GitHub repos, private skill indexes) | [Skills](/docs/user-guide/features/skills) — `hermes skills tap add <repo>` · [Publishing a tap](/docs/user-guide/features/skills#publishing-a-custom-skill-tap) |
| A first-class **core** inference provider (not a plugin) | [Adding Providers](/docs/developer-guide/adding-providers) |
See the full [Pluggable interfaces table](/docs/user-guide/features/plugins#pluggable-interfaces--where-to-go-for-each) for a consolidated view of every extension surface including config-driven (TTS, STT, MCP, shell hooks) and drop-in directory (gateway hooks) styles.
@ -854,6 +854,8 @@ version: 1.0.0
description: Custom image generation backend
```
**Full guide:** [Image Generation Provider Plugins](/docs/developer-guide/image-gen-provider-plugin) — full `ImageGenProvider` ABC, `list_models()` / `get_setup_schema()` metadata, `success_response()`/`error_response()` helpers, base64 vs URL output, user overrides, pip distribution.
**Reference examples:** `plugins/image_gen/openai/` (DALL-E / GPT-Image via OpenAI SDK), `plugins/image_gen/openai-codex/`, `plugins/image_gen/xai/` (Grok image gen).
## Non-Python extension surfaces
@ -921,7 +923,7 @@ Supports all the same events as Python plugin hooks (`pre_tool_call`, `post_tool
### Skill sources — add a custom skill registry
If you maintain a private GitHub repo of skills (or want to pull from a community index beyond the built-in sources), add it as a **tap**:
If you maintain a GitHub repo of skills (or want to pull from a community index beyond the built-in sources), add it as a **tap**:
```bash
hermes skills tap add myorg/skills-repo
@ -929,7 +931,9 @@ hermes skills search my-workflow --source myorg/skills-repo
hermes skills install myorg/skills-repo/my-workflow
```
**Full guide:** [Skills Hub](/docs/user-guide/features/skills#skills-hub).
Publishing your own tap is just a GitHub repo with `skills/<skill-name>/SKILL.md` directories — no server or registry signup needed.
**Full guides:** [Skills Hub](/docs/user-guide/features/skills#skills-hub) · [Publishing a custom tap](/docs/user-guide/features/skills#publishing-a-custom-skill-tap) (repo layout, minimal example, non-default paths, trust levels).
### TTS / STT via command templates

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@ -108,7 +108,7 @@ Every `ctx.*` API below is available inside a plugin's `register(ctx)` function.
| Gate on env vars | `requires_env: [API_KEY]` in plugin.yaml — prompted during `hermes plugins install` |
| Distribute via pip | `[project.entry-points."hermes_agent.plugins"]` |
| Register a gateway platform (Discord, Telegram, IRC, …) | `ctx.register_platform(name, label, adapter_factory, check_fn, ...)` — see [Adding Platform Adapters](/docs/developer-guide/adding-platform-adapters) |
| Register an image-generation backend | `ctx.register_image_gen_provider(provider)` — see `plugins/image_gen/openai/` for an example |
| Register an image-generation backend | `ctx.register_image_gen_provider(provider)` — see [Image Generation Provider Plugins](/docs/developer-guide/image-gen-provider-plugin) |
| Register a context-compression engine | `ctx.register_context_engine(engine)` — see [Context Engine Plugins](/docs/developer-guide/context-engine-plugin) |
| Register a memory backend | Subclass `MemoryProvider` in `plugins/memory/<name>/__init__.py` — see [Memory Provider Plugins](/docs/developer-guide/memory-provider-plugin) (uses a separate discovery system) |
| Register an inference backend (LLM provider) | `register_provider(ProviderProfile(...))` in `plugins/model-providers/<name>/__init__.py` — see [Model Provider Plugins](/docs/developer-guide/model-provider-plugin) (uses a separate discovery system) |
@ -228,11 +228,11 @@ The table above shows the four plugin categories, but within "General plugins" t
| A **gateway channel** (Discord / Telegram / IRC / Teams / etc.) | Platform plugin — `ctx.register_platform()` in `plugins/platforms/<name>/` | [Adding Platform Adapters](/docs/developer-guide/adding-platform-adapters) |
| A **memory backend** (Honcho, Mem0, Supermemory, …) | Memory plugin — subclass `MemoryProvider` in `plugins/memory/<name>/` | [Memory Provider Plugins](/docs/developer-guide/memory-provider-plugin) |
| A **context-compression strategy** | Context-engine plugin — `ctx.register_context_engine()` | [Context Engine Plugins](/docs/developer-guide/context-engine-plugin) |
| An **image-generation backend** (DALL·E, SDXL, …) | Backend plugin — `ctx.register_image_gen_provider()` | See bundled examples in `plugins/image_gen/openai/` and `plugins/image_gen/xai/` |
| An **image-generation backend** (DALL·E, SDXL, …) | Backend plugin — `ctx.register_image_gen_provider()` | [Image Generation Provider Plugins](/docs/developer-guide/image-gen-provider-plugin) |
| A **TTS backend** (any CLI — Piper, VoxCPM, Kokoro, xtts, voice-cloning scripts, …) | Config-driven — declare under `tts.providers.<name>` with `type: command` in `config.yaml` | [TTS setup](/docs/user-guide/features/tts#custom-command-providers) |
| An **STT backend** (custom whisper binary, local ASR CLI) | Config-driven — set `HERMES_LOCAL_STT_COMMAND` env var to a shell template | [Voice Message Transcription (STT)](/docs/user-guide/features/tts#voice-message-transcription-stt) |
| **External tools via MCP** (filesystem, GitHub, Linear, Notion, any MCP server) | Config-driven — declare `mcp_servers.<name>` with `command:` / `url:` in `config.yaml`. Hermes auto-discovers the server's tools and registers them alongside built-ins. | [MCP](/docs/user-guide/features/mcp) |
| **Additional skill sources** (custom GitHub repos, private skill indexes) | CLI — `hermes skills tap add <repo>` | [Skills Hub](/docs/user-guide/features/skills#skills-hub) |
| **Additional skill sources** (custom GitHub repos, private skill indexes) | CLI — `hermes skills tap add <repo>` | [Skills Hub](/docs/user-guide/features/skills#skills-hub) · [Publishing a custom tap](/docs/user-guide/features/skills#publishing-a-custom-skill-tap) |
| **Gateway event hooks** (fire on `gateway:startup`, `session:start`, `agent:end`, `command:*`) | Drop `HOOK.yaml` + `handler.py` into `~/.hermes/hooks/<name>/` | [Event Hooks](/docs/user-guide/features/hooks#gateway-event-hooks) |
| **Shell hooks** (run a shell command on events — notifications, audit logs, desktop alerts) | Config-driven — declare under `hooks:` in `config.yaml` | [Shell Hooks](/docs/user-guide/features/hooks#shell-hooks) |

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@ -464,6 +464,119 @@ This uses the stored source identifier plus the current upstream bundle content
Skills hub operations use the GitHub API, which has a rate limit of 60 requests/hour for unauthenticated users. If you see rate-limit errors during install or search, set `GITHUB_TOKEN` in your `.env` file to increase the limit to 5,000 requests/hour. The error message includes an actionable hint when this happens.
:::
### Publishing a custom skill tap
If you want to share a curated set of skills — for your team, your org, or publicly — you can publish them as a **tap**: a GitHub repository other Hermes users add with `hermes skills tap add <owner/repo>`. No server, no registry sign-up, no release pipeline. Just a directory of `SKILL.md` files.
#### Repo layout
A tap is any GitHub repo (public or private — private needs `GITHUB_TOKEN`) laid out like this:
```
owner/repo
├── skills/ # default path; configurable per-tap
│ ├── my-workflow/
│ │ ├── SKILL.md # required
│ │ ├── references/ # optional supporting files
│ │ ├── templates/
│ │ └── scripts/
│ ├── another-skill/
│ │ └── SKILL.md
│ └── third-skill/
│ └── SKILL.md
└── README.md # optional but helpful
```
Rules:
- Each skill lives in its own directory under the tap's root path (default `skills/`).
- The directory name becomes the skill's install slug.
- Each skill directory must contain a `SKILL.md` with standard [SKILL.md frontmatter](#skillmd-format) (`name`, `description`, plus optional `metadata.hermes.tags`, `version`, `author`, `platforms`, `metadata.hermes.config`).
- Subdirectories like `references/`, `templates/`, `scripts/`, `assets/` are downloaded alongside `SKILL.md` at install time.
- Skills whose directory name starts with `.` or `_` are ignored.
Hermes discovers skills by listing every subdirectory of the tap path and probing each for `SKILL.md`.
#### Minimal tap example
```
my-org/hermes-skills
└── skills/
└── deploy-runbook/
└── SKILL.md
```
`skills/deploy-runbook/SKILL.md`:
```markdown
---
name: deploy-runbook
description: Our deployment runbook — services, rollback, Slack channels
version: 1.0.0
author: My Org Platform Team
metadata:
hermes:
tags: [deployment, runbook, internal]
---
# Deploy Runbook
Step 1: ...
```
After pushing that to GitHub, any Hermes user can subscribe and install:
```bash
hermes skills tap add my-org/hermes-skills
hermes skills search deploy
hermes skills install my-org/hermes-skills/deploy-runbook
```
#### Non-default paths
If your skills don't live under `skills/` (common when you're adding a `skills/` subtree to an existing project), edit the tap entry in `~/.hermes/.hub/taps.json`:
```json
{
"taps": [
{"repo": "my-org/platform-docs", "path": "internal/skills/"}
]
}
```
The `hermes skills tap add` CLI defaults new taps to `path: "skills/"`; edit the file directly if you need a different path. `hermes skills tap list` shows the effective path per tap.
#### Installing individual skills directly (without adding a tap)
Users can also install a single skill from any public GitHub repo without adding the whole repo as a tap:
```bash
hermes skills install owner/repo/skills/my-workflow
```
Useful when you want to share one skill without asking the user to subscribe to your whole registry.
#### Trust levels for taps
New taps are assigned `community` trust by default. Skills installed from them run through the standard security scan and show the third-party warning panel on first install. If your org or a widely-trusted source should get higher trust, add its repo to `TRUSTED_REPOS` in `tools/skills_hub.py` (requires a Hermes core PR).
#### Tap management
```bash
hermes skills tap list # show all configured taps
hermes skills tap add myorg/skills-repo # add (default path: skills/)
hermes skills tap remove myorg/skills-repo # remove
```
Inside a running session:
```
/skills tap list
/skills tap add myorg/skills-repo
/skills tap remove myorg/skills-repo
```
Taps are stored in `~/.hermes/.hub/taps.json` (created on demand).
## Bundled skill updates (`hermes skills reset`)
Hermes ships with a set of bundled skills in `skills/` inside the repo. On install and on every `hermes update`, a sync pass copies those into `~/.hermes/skills/` and records a manifest at `~/.hermes/skills/.bundled_manifest` mapping each skill name to the content hash at the time it was synced (the **origin hash**).