webobsidian

WebObsidian Agent skill

Operate a WebObsidian vault over its Agent REST API at /api/v1. Everything is a plain HTTP call authenticated with an API key.

Credentials (read these first, every session)

Credentials live in ~/.webobsidian/credentials.json:

{ "baseUrl": "https://your-webobsidian.example.com", "apiKey": "wok_xxxxxxxx" }

Before the first request in a session, load them into shell variables:

BASE=$(python3 -c 'import json,os;print(json.load(open(os.path.expanduser("~/.webobsidian/credentials.json")))["baseUrl"].rstrip("/"))')
KEY=$(python3 -c 'import json,os;print(json.load(open(os.path.expanduser("~/.webobsidian/credentials.json")))["apiKey"])')

If ~/.webobsidian/credentials.json does not exist or a call returns 401:

1. Ask the user for their WebObsidian base URL (e.g. https://notes.example.com or http://host:8787) and their API key. They create the key in the app at Settings → API Keys (choose scopes read / write / search). Keys look like wok_….
2. Save it (never echo the key back):

   mkdir -p ~/.webobsidian && chmod 700 ~/.webobsidian
   cat > ~/.webobsidian/credentials.json <<JSON
   { "baseUrl": "<BASE_URL>", "apiKey": "<API_KEY>" }
   JSON
   chmod 600 ~/.webobsidian/credentials.json
   

3. Verify with the health + an authenticated call, then proceed.

Security rules: never print, log, or commit the API key. Never write it into vault notes. If a command would expose it, redact it.

Sanity check

curl -s "$BASE/api/v1/health"                          # liveness, no auth
curl -s -H "X-API-Key: $KEY" "$BASE/api/v1/tags" | head # confirms the key works

Authentication

Send the key as a header on every /api/v1 request (either form works):

X-API-Key: wok_xxx
Authorization: Bearer wok_xxx

Scopes per key: read, write, search. A call outside the key's scope returns 403. Rate-limited (default 120 req/min/key) → 429 when exceeded; back off and retry.

Endpoint reference

All {path} values are vault-relative and must be URL-encoded (curl -G --data-urlencode for queries; encode /-containing paths in the URL path, e.g. Notes/Ideas.md → Notes%2FIdeas.md is accepted, plain Notes/Ideas.md also works).

Method	Path	Scope	Description
GET	/api/v1/health	–	Liveness check
GET	/api/v1/notes?offset=&limit=	read	List markdown notes (paginated)
GET	/api/v1/notes/{path}	read	Read a note + parsed metadata
PUT	/api/v1/notes/{path}	write	Create / overwrite a note — body {"content":"..."}
PATCH	/api/v1/notes/{path}	write	Append — body {"append":"..."}
DELETE	/api/v1/notes/{path}	write	Move note to trash
GET	/api/v1/search?q=&limit=	search	QMD search (fielded: tag:, path:, title:)
GET	/api/v1/backlinks?path=	read	Notes linking to a path
GET	/api/v1/tags	read	All tags with counts

Recipes

# List 10 notes
curl -s -H "X-API-Key: $KEY" "$BASE/api/v1/notes?limit=10"

# Read a note (URL-encode the path's query value if it has spaces/slashes)
curl -s -H "X-API-Key: $KEY" "$BASE/api/v1/notes/Welcome.md"

# Create or overwrite a note
curl -s -X PUT -H "X-API-Key: $KEY" -H 'Content-Type: application/json' \
  -d '{"content":"# Title\n\nBody written by the agent."}' \
  "$BASE/api/v1/notes/Agent/Generated.md"

# Append to a note (creates it if missing)
curl -s -X PATCH -H "X-API-Key: $KEY" -H 'Content-Type: application/json' \
  -d '{"append":"\n- another bullet"}' \
  "$BASE/api/v1/notes/Agent/Generated.md"

# Delete a note (→ trash)
curl -s -X DELETE -H "X-API-Key: $KEY" "$BASE/api/v1/notes/Agent/Generated.md"

# Full-text search (fielded queries supported)
curl -s -G -H "X-API-Key: $KEY" "$BASE/api/v1/search" \
  --data-urlencode "q=tag:idea graph" --data-urlencode "limit=5"

# Backlinks for a note
curl -s -G -H "X-API-Key: $KEY" "$BASE/api/v1/backlinks" --data-urlencode "path=Welcome.md"

# All tags with counts
curl -s -H "X-API-Key: $KEY" "$BASE/api/v1/tags"

Response shapes

// GET /api/v1/notes/{path}
{ "path": "Welcome.md", "content": "...", "title": "Welcome",
  "frontmatter": { "tags": ["welcome"] }, "tags": ["welcome"], "links": ["Notes/Ideas"] }

// GET /api/v1/search
{ "query": "graph", "hits": [
  { "path": "Notes/Ideas.md", "title": "Ideas", "score": 4.2, "tags": ["idea"], "snippet": "…" } ] }

Obsidian Flavored Markdown (write notes in this dialect)

The vault is a real Obsidian vault — the user also opens these files in the Obsidian app, so write Obsidian Flavored Markdown, not plain Markdown. Use [[wikilinks]] for links between vault notes (Obsidian tracks renames); use [text](url) only for external URLs.

Properties (YAML frontmatter)

At the very top of the note, between --- fences. Default keys: tags, aliases, cssclasses. Preserve existing frontmatter on overwrite.

---
title: My Note
date: 2024-01-15
tags:
  - project
  - active
aliases:
  - Alternative Name
---

Wikilinks (internal links)

[[Note Name]]                 Link to a note
[[Note Name|Display Text]]    Custom display text
[[Note Name#Heading]]         Link to a heading
[[Note Name#^block-id]]       Link to a block
[[#Heading in same note]]     Same-note link

Block references

Append ^block-id to a paragraph; for lists/quotes put the id on its own line after the block.

This paragraph can be linked to. ^my-block-id

Embeds / transclusion (prefix a wikilink with !)

![[Note Name]]                Embed a whole note
![[Note Name#Heading]]        Embed one section
![[image.png]]                Embed an image
![[image.png|300]]            Embed with width
![[document.pdf#page=3]]      Embed a PDF page

Callouts

> [!note]
> Basic callout.

> [!warning] Custom Title
> Callout with a custom title.

> [!faq]- Collapsed by default
> Foldable callout (`-` starts collapsed, `+` starts expanded).

Common types: note, tip, info, warning, danger, success, failure, question, example, quote, bug, abstract, todo.

Tags

#tag            inline tag
#nested/tag     hierarchical tag

Letters, digits (not first char), _, -, /. Tags also go in frontmatter tags:.

Tasks

- [ ] Pending task
- [x] Completed task

Other syntax

==highlight==   **bold**   *italic*
Footnote[^1].          [^1]: Footnote text.       Inline footnote.^[Inline text.]
Visible %%hidden inline comment%% text.            $e^{i\pi}+1=0$  (inline math)

$$\frac{a}{b} = c$$         (block math, KaTeX)

```mermaid
graph TD
  A --> B
```

Editing rules

• Prefer PATCH append over PUT when only adding content, so you don't clobber a note.
• Read before you overwrite an existing note unless the user explicitly wants a fresh replace; preserve its frontmatter and formatting.
• Paths are case-sensitive and notes must include the .md extension.
• When you reference another note, link it ([[Other Note]]) instead of writing a bare name — it keeps the graph and backlinks intact.

Troubleshooting

• 401 → key missing/invalid → re-run the credentials flow above.
• 403 → the key lacks the required scope → ask the user to create a key with the needed scope (read/write/search).
• 404 on a note → wrong path/casing, or it's in .trash.
• 429 → rate limited → wait and retry.
• Connection refused / TLS error → confirm the base URL and that the server is reachable.