Optimike Obsidian MCP

French version: README.fr.md Operations guide: OPERATIONS.md Guide d’exploitation (FR): OPERATIONS.fr.md

MCP (Model Context Protocol) server for Obsidian with shared local caching, integrated Tasks tools, and semantic search powered by Smart Connections.

TL;DR

npm install
npm run build
node dist/stdio-proxy.js

Recommended for Codex: point your MCP config to dist/stdio-proxy.js, not directly to dist/index.js.

Prerequisites

• Node.js >= 22.7.5

• Obsidian Desktop for live mode. Headless modes only require a local vault path.

• Plugins:

  • Local REST API (required for live REST tools): https://github.com/coddingtonbear/obsidian-local-rest-api

  • Smart Connections (required for semantic search): https://github.com/brianpetro/obsidian-smart-connections

  • Bases Bridge (REST) (required for live/plugin-backed .base tools, bundled in this repo)

  • Obsidian Tasks plugin (required for canonical Tasks behavior)

• For semantic search, make sure your vault has a .smart-env folder

Installation

From source:

git clone https://github.com/optimikelabs/optimike-obsidian-mcp.git
cd optimike-obsidian-mcp
npm install
npm run build

Run the recommended local MCP entrypoint:

node dist/stdio-proxy.js

Why

• Connect Obsidian to MCP agents (Codex, IDEs, etc.)

• Expose Obsidian REST tools (read/write, frontmatter, tags, search)

• Provide local vector search via Smart Connections (.smart-env)

• Keep one durable local backend instead of re-spawning heavy state on every stdio run

What it can do

Optimike Obsidian MCP gives agents a structured way to work with an Obsidian vault:

• read, list, update, and search notes

• manage frontmatter and tags

• query and update Obsidian Bases through the bundled Bases Bridge

• inspect and query Obsidian Tasks

• run semantic search against a Smart Connections index

• check server health, cache state, degraded mode, and write policy

In short: it does more than read notes. It exposes the vault as an operational MCP surface, with read/write tools, structured metadata operations, Tasks, Bases, semantic search, and server health/status observability.

Shared backend use

The durable backend is useful in local setups, but it becomes especially valuable in shared or remote backend setups.

Instead of syncing and indexing the vault separately for every agent client, clients can talk to one MCP backend that owns the cache, semantic metadata, task cache, and Obsidian operations. The backend still needs access to the vault itself, a mounted vault path, or the Obsidian REST API, but the agent clients do not each need their own full vault sync or indexing layer.

This makes the MCP a practical boundary between agents and Obsidian: agents call tools, the backend handles the vault.

Highlights

• Complete MCP toolset (notes, frontmatter, tags, global search, etc.)

• Integrated Tasks tools: list_all_tasks and query_tasks

• Local semantic search smart_semantic_search

• Server health/status tools: obsidian_runtime_status and obsidian_runtime_maintenance

• Read-only degraded mode for obsidian_read_note and obsidian_list_notes when Obsidian REST is down

• Shared SQLite store for vault content, task cache, and semantic manifest data

• Embedder‑agnostic: query embedding aligned to the vault model

• Ollama / OpenAI support (env overrides); Xenova / Transformers is disabled until its vulnerable ONNX/protobuf chain can be safely reintroduced

Architecture (overview)

1. Obsidian + plugins (Local REST API, Bases Bridge, Smart Connections)

2. Optimike Obsidian MCP (this server)

3. MCP Agents (Codex, IDEs, etc.)

The server acts as a bridge between agents and Obsidian, adds a “Base” layer for .base files, and persists shared runtime state locally so Codex can stay fast and stable across runs.

Bases Bridge (REST) — why & how

Obsidian has no native API for Bases (.base).
The Bases Bridge (REST) plugin fills the gap by adding dedicated REST endpoints.

Endpoints exposed by Bases Bridge

Official prefix (recommended):

• GET /extensions/obsidian-bases-bridge/bases
  List all available bases.

• GET /extensions/obsidian-bases-bridge/bases/:id/schema
  Return the schema (properties, formulas, views).

• POST /extensions/obsidian-bases-bridge/bases/:id/query
  Query a base (filters, sorting, pagination, evaluate).

• POST /extensions/obsidian-bases-bridge/bases/:id/upsert
  Bulk frontmatter upsert.

• POST /extensions/obsidian-bases-bridge/bases
  Create/validate a .base file.

• GET /extensions/obsidian-bases-bridge/bases/:id/config
  Read the base YAML.

• PUT /extensions/obsidian-bases-bridge/bases/:id/config
  Update the base YAML.

Legacy aliases (MCP compat):

• GET /bases

• GET /bases/:id/schema

• POST /bases/:id/query

• POST /bases/:id/upsert

• POST /bases

• GET /bases/:id/config

• PUT /bases/:id/config

Engine / Evaluate

When evaluate: true, the bridge returns:

• source: "engine": auto‑cache + formula evaluation (no Bridge view)

• source: "fallback": partial on‑disk evaluation if engine is OFF

MCP tools for Bases

This server exposes “Base” MCP tools:

• bases_list : list bases

• bases_get_schema : fetch schema

• bases_query : paged query with filters/sort

• bases_upsert_rows : bulk frontmatter update

• bases_upsert_config : validate or update base YAML/JSON config

• bases_create : create/validate a .base

bases_upsert_rows is batch-safe by default for live Obsidian writes: it runs a live preflight, supports dryRun, configurable chunkSize, delayMs, maxRetries, retryBackoffMs, and requestTimeoutMs, and returns a structured summary with changed_count, failed_count, failed_operations, and retry metadata. For large or sensitive batches, prefer dryRun: true first, then chunkSize: 1, continueOnError: true, and maxRetries: 2.

Protected or virtual keys (file.*, formula.*, création/creation, modification) are refused before writing. Bridge-side processFrontMatter timeouts are surfaced as retryable write_timeout errors; treat them as an Obsidian busy/indexing/locked signal before blaming the payload.

Final Runtime Model

The repo supports two local runtime modes:

• stdio proxy (recommended for Codex): a lightweight stdio process that auto-starts a local Streamable HTTP backend if needed

• http backend: the actual long-lived backend process that owns the heavy cache / warmup work

The backend persists vault content to a shared SQLite store and keeps only a bounded hot set in RAM. By default the cache lives at:

<vault>/.obsidian/optimike-mcp/shared-cache.sqlite

The same database also stores:

• file_cache for note content

• task_file_cache for parsed Tasks data

• semantic_manifest and semantic_vectors for semantic metadata

If OBSIDIAN_VAULT is not set, the server falls back to the parent vault inferred from SMART_ENV_DIR, then to the project root.

Useful env overrides:

• OBSIDIAN_RUNTIME_MODE=live|hybrid|headless-readonly|headless-guarded|headless-filesystem to choose the runtime contract

• OBSIDIAN_SHARED_CACHE_DB_PATH to move the shared SQLite file

• OBSIDIAN_CONTENT_HOT_CACHE_LIMIT to tune the bounded in-memory hot set

• OBSIDIAN_CACHE_SOURCE=auto|filesystem|rest to choose cache refresh source (auto prefers the local vault path when available)

• OBSIDIAN_CACHE_CONCURRENCY to bound local filesystem refresh work

• OBSIDIAN_VAULT_EXCLUDE_PATTERNS to add comma- or newline-separated gitignore-style exclusions on top of the built-in vault safety policy

• MCP_WRITE_MODE=readonly|guarded|full to enforce server-side write safety (full is the default; set guarded or readonly explicitly to harden a host)

• MCP_GUARDED_MAX_WRITE_CHARS and MCP_GUARDED_MAX_BATCH_OPERATIONS to tune guarded-mode limits

For production-like tests on a real vault, set OBSIDIAN_SHARED_CACHE_DB_PATH outside the vault so validation databases do not pollute the synced note tree.

Vault exclusion policy:

• Built-in filesystem/cache exclusions cover .obsidian, .trash, .git, .tmp, tmp, node_modules, screenshots folders, build/cache folders, SQLite/DB files, and log files.

• OBSIDIAN_VAULT_EXCLUDE_PATTERNS lets an operator add project-specific exclusions, for example tmp/**,**/tmp/**,Efforts/Archives/**.

• Exclusions apply to filesystem cache refreshes and local Bases fallback scans. They do not claim Desktop parity and they do not stop Obsidian Sync itself from downloading files; use a clean server vault or Sync-side hygiene for that.

• npm run check:vault-exclusions -- --vault=/path/to/vault prints the policy effect before running a long headless validation.

This runtime exposes the Tasks surface directly from the main MCP, so Codex no longer needs a second dedicated optimike-obsidian-tasks-mcp entry when using this server. Warm semantic refreshes now load from SQLite first instead of re-reading the whole .smart-env path every time.

Runtime modes

• live (default): Obsidian Desktop + Local REST API. Full REST, write, and Bases Bridge surface.

• hybrid: starts from the local vault/cache and uses Local REST API when OBSIDIAN_API_KEY is configured. The API startup check is non-blocking. If no API key is configured, OBSIDIAN_VAULT is required.

• headless-readonly: no Obsidian Desktop, no Local REST API, no OBSIDIAN_API_KEY. Requires OBSIDIAN_VAULT; set OBSIDIAN_CACHE_SOURCE=filesystem for an explicit server profile. Exposes read/list/search/tasks/semantic/runtime tools plus local readonly bases_list, bases_get_schema, and bases_query.

• headless-guarded: no Obsidian Desktop; exposes the headless read surface plus guarded filesystem writes for obsidian_update_note, obsidian_search_replace, and obsidian_manage_frontmatter. Note updates are append/prepend only; overwrite remains blocked by the guarded write policy. Local readonly Bases fallback is also available.

• headless-filesystem: no Obsidian Desktop; exposes headless-guarded plus bounded filesystem features: frontmatter/inline tags, local tag index/audit and dry-run rename, admin move/archive/delete operations with expectedHash or expectedMtime, batch frontmatter with dry-run, .base YAML create/config, Bases rows as Markdown frontmatter set operations, and minimal JSON Canvas create/validate helpers.

Headless means Optimike MCP running over a synchronized Markdown vault. It does not mean Obsidian Desktop, community plugins, command palette, active file, or Bases Bridge are available without Desktop.

Smoke tests and runtime contract:

npm run test:runtime
npm run smoke:headless-readonly
npm run smoke:hybrid-unavailable
npm run smoke:hybrid-api-available
npm run smoke:headless-guarded
npm run smoke:headless-filesystem
npm run smoke:headless-status
npm run check:vault-exclusions -- --vault=/path/to/vault
npm run test:headless-long-run
npm run snapshot:vault
npm pack --dry-run

npm run test:runtime runs the build, all runtime mode smokes, and the HTTP health/status smoke. It uses temporary vaults and does not require a real Obsidian vault or API key. The headless smokes also assert that excluded tmp/** content is not indexed.

For a mode-by-mode comparison, see Runtime Capability Matrix. For the dedicated server path, see Headless Server Profile. For agent routing across MCP, Desktop/API, filesystem, CLI, and format skills, see MCP Routing Guide.

Format validation:

• obsidian_validate_format is available in every runtime mode.

• It validates Obsidian Markdown, .base YAML, and JSON Canvas structure before writes.

• It catches local format issues but does not render Obsidian, load plugins, or evaluate exact Bases UI semantics.

Local Bases fallback:

• bases_list, bases_get_schema, and bases_query are available in headless modes with source: "local-fallback".

• The fallback reads .base YAML from OBSIDIAN_VAULT and cached Markdown frontmatter from the shared cache.

• It supports direct equality filters, arrays, contains, in, comparisons, simple sorting, pagination, and schema inspection.

• It does not evaluate Obsidian formulas, plugin-specific filters, calculated properties, or exact UI view semantics.

Useful scripts:

npm run build
npm run start:proxy
npm run start:http

Health endpoint when running the backend directly:

curl http://127.0.0.1:3010/healthz

Extended health / maintenance:

• GET /healthz?integrity=1 adds a SQLite integrity check

• MCP tool obsidian_runtime_status returns process, cache, semantic, and degraded-mode status

• MCP tool obsidian_runtime_maintenance supports:

  • integrity_check

  • run_maintenance

  • refresh_vault_cache

  • refresh_semantic_cache

  • refresh_tasks_cache

  • refresh_all

Runtime write safety:

• readonly blocks all write tools except validation-only operations

• guarded allows bounded explicit writes and blocks destructive operations such as delete, overwrite, frontmatter unset, broad regex replace-all, and large batches

• full is the default and keeps unrestricted write behavior for trusted local environments

Guarded filesystem writes support optional expectedHash and expectedMtime preconditions. Use expectedHash for multi-agent or synced-vault writes so stale updates fail as explicit conflicts instead of overwriting newer content.

Agent-context controls:

• obsidian_list_notes supports responseMode="compact", limit, and cursor

• obsidian_global_search supports responseMode="compact" while keeping existing page/pageSize pagination

• list_all_tasks and query_tasks support responseMode="compact"|"detailed", responseLimit, and cursor

• reading an identified note remains full-fidelity through obsidian_read_note

Typical checks:

curl http://127.0.0.1:3010/healthz
curl http://127.0.0.1:3010/healthz?integrity=1

Minimal Codex Config

In ~/.codex/config.toml:

[mcp_servers.optimike-obsidian-mcp-stdio]
command = "node"
args = ["/path/to/optimike-obsidian-mcp/dist/stdio-proxy.js"]

tool_timeout_sec = 900

[mcp_servers.optimike-obsidian-mcp-stdio.env]
MCP_HTTP_HOST = "127.0.0.1"
MCP_HTTP_PORT = "3010"
MCP_PROXY_START_TIMEOUT_MS = "20000"
OBSIDIAN_VAULT = "/path/to/<vault>"

# Smart Connections
SMART_ENV_DIR = "/path/to/<vault>/.smart-env"
ENABLE_QUERY_EMBEDDING = "true"

# Recommended: auto (do not set)
# QUERY_EMBEDDER = "auto"

# Obsidian REST (if Local REST API plugin is active)
OBSIDIAN_BASE_URL = "http://127.0.0.1:27123"
OBSIDIAN_API_KEY  = "<token>"

# Startup behavior (optional, recommended for faster startup)
# OBSIDIAN_STARTUP_BLOCKING=false starts MCP immediately and runs health check in background.
OBSIDIAN_STARTUP_MAX_RETRIES = "2"
OBSIDIAN_STARTUP_RETRY_DELAY_MS = "1200"
OBSIDIAN_STARTUP_BLOCKING = "false"

# Shared cache tuning (optional)
# OBSIDIAN_SHARED_CACHE_DB_PATH = "/path/to/<vault>/.obsidian/optimike-mcp/shared-cache.sqlite"
# OBSIDIAN_CONTENT_HOT_CACHE_LIMIT = "64"

Notes:

• Keep this config local in ~/.codex/config.toml (do not commit personal machine paths).

• Use logical placeholders in documentation (/path/to/...) and keep real paths only in local config.

• dist/index.js is still the backend entrypoint, but Codex should point to dist/stdio-proxy.js.

Obsidian Local REST API Setup

Local REST API plugin repo: https://github.com/coddingtonbear/obsidian-local-rest-api

In Obsidian:

1. install and enable Local REST API

2. enable the HTTP server

3. copy the API key

4. set OBSIDIAN_BASE_URL and OBSIDIAN_API_KEY in your MCP env

Example:

export OBSIDIAN_BASE_URL=http://127.0.0.1:27123
export OBSIDIAN_API_KEY=<your_api_key>

Security

• Keep OBSIDIAN_API_KEY private and local.

• Do not expose the Obsidian REST API to the public internet.

• Keep OBSIDIAN_API_KEY and OPENAI_API_KEY in environment variables, not committed config files.

• Current dependency check: npm audit reports 0 known vulnerabilities, and npm audit signatures verifies registry signatures for the installed npm dependency tree.

• If you expose the MCP over HTTP beyond localhost, enable MCP_AUTH_MODE=jwt or MCP_AUTH_MODE=oauth, use a strong secret/provider, and keep MCP_ALLOWED_ORIGINS narrow. The default stdio / 127.0.0.1 profile is the safer local setup.

Legacy WSL2 Troubleshooting: Obsidian on Windows

Most local setups should use the native stdio entrypoint and 127.0.0.1. This section is only for older or explicit WSL2 setups where Obsidian runs on Windows and Codex runs inside WSL2:

• 127.0.0.1 from WSL points to WSL, not Windows

• use the Windows host IP (the WSL gateway) for OBSIDIAN_BASE_URL

Example:

GW=$(ip route | awk '/default/ {print $3; exit}')
export OBSIDIAN_BASE_URL=http://$GW:27123

If you use a Windows portproxy, adapt the port accordingly.

Main MCP Surface

The main MCP now includes:

• note tools: read, list, update, search-replace, tags, frontmatter

• Bases tools: list, schema, query, create, upsert config, upsert rows

• Tasks tools: list_all_tasks, query_tasks

• semantic tools: smart_semantic_search, smart_search, smart-search

• server health/status tools: obsidian_runtime_status, obsidian_runtime_maintenance

Tasks Integration

The main MCP now owns the Tasks surface directly.

What this means:

• Codex does not need a separate optimike-obsidian-tasks-mcp entry anymore

• list_all_tasks and query_tasks are exposed by this main server

• parsed task data is persisted in task_file_cache inside the shared SQLite database

Dependencies for Tasks support:

• Obsidian vault access

• shared cache database

• Obsidian Tasks plugin configuration file at:

<vault>/.obsidian/plugins/obsidian-tasks-plugin/data.json

How it works:

1. note content is indexed in file_cache

2. task parsing reuses that content instead of rescanning the vault from scratch

3. parsed tasks are stored in task_file_cache

4. list_all_tasks and query_tasks reuse that persisted layer

This gives you one MCP surface, one runtime, and one durable local data path.

Required and useful Obsidian plugins

Required depending on the MCP surfaces you use:

• Local REST API: Obsidian API used by MCP.

• Bases Bridge (REST): .base support via REST.

• Smart Connections: vector index and .smart-env for semantic search.

Semantic search (Smart Connections)

Tool: smart_semantic_search (aliases: smart_search, smart-search).

Example:

{ "query": "publication X threads", "top_k": 10, "with_snippets": false }

The server:

• reads .smart-env/multi/*.ajson

• selects the dominant dimension

• embeds the query with the same model as the vault

• persists a semantic manifest in SQLite for faster warm refreshes

• prewarms semantic search on startup by loading the snapshot and warming the query embedder

• returns timings_ms, vector_count, and filtered_count for operational diagnosis

Important:

• semantic query execution still requires a reachable query embedder provider

• if the vault was built with Ollama embeddings, an unreachable Ollama instance will produce a clear error instead of a silent hang

• set SEMANTIC_SEARCH_PREWARM=false to disable startup prewarm

That means:

• the semantic metadata path is now durable and observable

• the final query still depends on a live embedding provider at request time

Providers (optional override)

Ollama (local)

export QUERY_EMBEDDER=ollama
export QUERY_EMBEDDER_MODEL=snowflake-arctic-embed2
export OLLAMA_BASE_URL=http://127.0.0.1:11434

Xenova / Transformers

The local Xenova provider is disabled for now because its ONNX/protobuf dependency chain was affected by npm audit vulnerabilities. Use Ollama locally, or OpenAI in cloud mode.

OpenAI (cloud)

export QUERY_EMBEDDER=openai
export QUERY_EMBEDDER_MODEL=text-embedding-3-small
export OPENAI_API_KEY=...
# export OPENAI_EMBEDDING_DIMENSIONS=1024

MCP sharing: portability

For shared MCP setups, avoid hard‑coding OLLAMA_BASE_URL inside the vault. Keep auto mode and let each user override via env vars.

Legacy Tasks Repo

optimike-obsidian-tasks-mcp can still exist as a legacy standalone repo, but Codex no longer needs it when using this main server. The main MCP is now the canonical surface.

More Documentation

• Product overview and install: this README

• Runtime and maintenance guide: OPERATIONS.md

• Mode-by-mode capability matrix: docs/runtime-capability-matrix.md

• Dedicated headless server profile: docs/headless-server-profile.md

• Agent routing guide: docs/mcp-routing-guide.md

• Current tool surface: docs/obsidian_mcp_tools_spec.md

• French README: README.fr.md

Credits

• Created by Optimike (Mickaël Ahouansou)

License

See LICENSE.