pkm-write

name	pkm-write
description	Use when writing to the vault — creating new notes (vault_write), editing existing notes (vault_edit, vault_append, vault_update_frontmatter). Handles duplicate checking, link discovery, annotations, and index updates for new notes. Provides guidelines for modifications.

PKM Write — Vault Writing with Knowledge Graph Integration

Follow these steps when creating new notes. When running as a subagent, the delegation prompt provides the note topic and project context.

Step 1: Duplicate Check

Before creating, search for existing notes on the same topic:

vault_semantic_search({ query: "<topic/title of intended note>", limit: 5 })

If vault_semantic_search is unavailable (no VAULT_PKM_OPENAI_KEY), use vault_search with the note's title and key terms, and vault_query with matching tags to check for duplicates.

Route based on results. Note on score interpretation: vault_semantic_search uses text-embedding-3-large (3072-dim) cosine similarity, which compresses hard. Even a verbatim title/heading of an existing note typically scores around 0.55–0.65 against that note; scores above 0.7 are essentially never observed. Read the scores with that scale in mind.

• Likely duplicate (top hit ≥ 0.5): Read the top hit with vault_read and confirm it's actually about the same topic before routing — a 0.5 score can be a real duplicate or a same-domain neighbor. If it IS the same topic: update the existing note instead of creating a new one — vault_append to add new content or vault_edit to refine existing content; vault_update_frontmatter if metadata changed. Skip to Step 4 (Discover Connections) after updating. If it's a same-domain neighbor (related but distinct topic), treat as a partial match.
• Partial matches (top hit < 0.5, or top hit ≥ 0.5 but verified as a neighbor): Mention as potentially related, proceed with creation at Step 2. Link to them in Step 6.
• No matches at all: Proceed with creation at Step 2.

Step 2: Create the Note

Use vault_write with the appropriate template. Select the template and path based on content type:

Content Type	Template	Default Path
Architecture decision	adr	<project>/development/decisions/ADR-NNN-{title}.md
Research finding	research-note	<project>/research/{title}.md
Bug investigation	troubleshooting-log	<project>/development/debug/{title}.md
Reusable knowledge	permanent-note	03-Resources/Development/{title}.md
Task	task	<project>/tasks/{title}.md
Meeting record	meeting-notes	<project>/planning/{title}.md
Literature/article notes	literature-note	03-Resources/{title}.md

Where <project> is the vault project path (e.g., 01-Projects/MyApp). Determine from the delegation prompt, CLAUDE.md # PKM: annotation, or SessionStart hook context.

Notes in 03-Resources/ should be written as project-agnostic knowledge — useful regardless of where the insight originated. Use frontmatter tags or ## Related links to trace the origin project, but write the content for a general audience.

If CLAUDE.md specifies a different location for a content type, use that instead.

vault_write({
  template: "<template>",
  path: "<path-from-table>",
  frontmatter: { tags: [...], ... }
})

Ensure:

• At least one meaningful tag
• {title} uses kebab-case (e.g., cache-eviction-strategies)
• For ADRs, use vault_list on the decisions directory to determine the next NNN number

Step 3: Populate Content

vault_write creates a skeleton from the template — headings with HTML comment placeholders and empty bullets. You must fill in the actual content.

1. Read the note with vault_read to see the exact template output
2. Replace placeholders with vault_edit, using the exact text from the read output as old_string

Work section by section. Each vault_edit call must match text exactly as it appears in the file — do NOT guess what the template produced.

For templates with many sections, you can batch multiple sections into fewer edits by using a larger old_string that spans consecutive sections.

Don't forget the link sections. Templates include link sections like ## Related, ## Links, and ## References with their own placeholder block — an HTML comment plus an empty bullet. The exact comment text varies per template (e.g., <!-- Format: - [[note-name]] — relationship explanation --> in most templates, <!-- External references: docs, articles, repos --> in research-note's ## Links). Read the file first to get the exact placeholder text, then vault_edit to remove it. vault_add_links in Step 6 appends new links below whatever already exists in the section — it does not replace the placeholder, so leftover stubs end up sitting above the real links.

Step 4: Discover Connections

Run vault_suggest_links on the new note to find related content:

vault_suggest_links({ path: "<path-to-new-note>", limit: 8 })

Select the top 3–5 most relevant suggestions.

If vault_suggest_links is unavailable (no OPENAI_API_KEY), use vault_search with key terms from the note's title/topic and vault_query with matching tags to manually identify good link targets.

If no suggestions are returned (new vault or isolated topic), skip Steps 5–7 — the note's ## Related section will be filled as the graph grows.

Well-linked-existing-note carve-out (UPDATE path only). If you arrived here via the Step 1 UPDATE branch and the existing note's ## Related already covers the connections you would otherwise add — i.e., the top suggestions from vault_suggest_links are already linked, or are clearly weaker than what's already there — skip Steps 5–7. Forcing additional links to a note that's already well-curated degrades link quality. This carve-out applies only to UPDATE; new notes always work through Steps 5–7.

Step 5: Draft Annotations

For each selected link, write a one-line annotation explaining the relationship.

Good annotations use specific relationship language:

• "builds on", "supersedes", "implements", "contradicts", "provides context for", "extends", "is an instance of"

Bad: - [[note]] — related to this topic Good: - [[architecture-patterns]] — foundational patterns this decision builds on

Use the note's content, shared tags, and conversation context to produce meaningful explanations.

Step 6: Insert Links

Add annotated links to the note using vault_add_links:

vault_add_links({
  path: "<path-to-new-note>",
  links: [
    { target: "<vault-relative-path>", annotation: "relationship explanation" },
    { target: "<vault-relative-path>", annotation: "relationship explanation" }
  ]
})

The tool handles deduplication (skips already-linked targets), creates ## Related if missing, and validates targets exist. Format annotations as specific relationship language (see Step 5).

If the note uses a non-standard section (e.g., ## References), pass section: "## References".

If the template does not include a ## Related section, vault_add_links will create it automatically (default create_section: true). Templates with ## Related built in: adr, permanent-note, research-note, troubleshooting-log, literature-note, moc, meeting-notes.

Note: MOC notes created before this version may use ## Related Topics instead of ## Related. If vault_add_links fails with "Section not found", try section: "## Related Topics".

Step 7: Bidirectional Linking

For significant note types (ADR, permanent-note, research-note, troubleshooting-log, literature-note, moc, meeting-notes):

• Check if the top 1–2 target notes would benefit from a backlink to this new note
• If yes, add a backlink to their ## Related section using vault_add_links

Skip for ephemeral types (fleeting-note, daily-note) — Obsidian's native backlinks panel is sufficient.

Step 8: Index Update

• If the note is an ADR: add a wikilink to the project's _index.md
• If the note is project-scoped: ensure the project _index.md references it where appropriate

---

Modifying Existing Notes

Guidelines for edits, appends, and frontmatter updates. These don't require the full creation workflow above.

vault_edit — Surgical String Replacement

• Check if edits affect link targets: renaming a heading breaks [[note#heading]] wikilinks pointing to it
• After significant content changes, consider running vault_suggest_links to discover new connections worth adding

vault_append — Adding Content

• Devlog entries: Use vault_append({ heading: "## Sessions", position: "after_heading" }) for reverse-chronological ordering
• Section additions: Specify the heading param to insert in the right location rather than appending at EOF

vault_update_frontmatter — Atomic Field Updates

• Prefer vault_update_frontmatter over vault_edit for YAML fields — it parses and re-serializes safely
• Protected fields (type, created, tags) can be updated but not removed
• Task status/priority have enum validation: status must be pending/active/done/cancelled, priority must be low/normal/high/urgent