LucidLink MCP server

Read from the package source without running it. The installed server may list more.

• append_file

  Append to a file (creates if missing).

• claim_file

  Acquire an exclusive (or shared) lock over an ENTIRE file.

• copy_file

  Copy/duplicate/back up a file within the filespace.

• count_files

  Count files and directories under a path, optionally filtered by name pattern.

• create_directorywrite action

  Create a directory, including any missing parent directories (``mkdir -p``). Succeeds if the directory already exists.

• current_filespace

  Return the current account's linked filespaces (current one first), or a hint if none is linked.

• delete_pathwrite action

  Delete a file or directory.

• edit_lines

  Replace lines [start_line, end_line] (inclusive, 1-indexed) with ``new_content``.

• filespace_stats

  Summarize the linked filespace: entry count, stored size, and external-file totals. For a files-vs-directories breakdown, use ``count_files`` (a tree walk).

• find_files

  Find files / directories by name (fnmatch glob).

• get_entry

  Return metadata for a single file or directory.

• grep_files

  Search file CONTENTS via Python regex (re.search).

• link_external_file

  Link an S3 object as a read-only file in the linked filespace.

• link_external_url

  Link a direct HTTP/HTTPS URL as a read-only file in the filespace.

• link_filespace

  Make a filespace the current one for filesystem / locking / audit tools, linking it if needed.

• list_accounts

  List the configured named accounts (service-account identities).

• list_data_stores

  List data stores registered on the linked filespace, with their kind.

• list_external_files

  Paginated listing of files linked from a data store.

• list_files

  List entries in a directory of the linked filespace.

• list_filespaces

  List filespaces visible to a service account.

• list_locks_held

  List byte-range locks currently held by THIS MCP process.

• lock_byte_range

  Acquire a byte-range lock on a file in the current filespace.

• move_path

  Move/rename within the same filespace (atomic where possible).

• poll_changes

  Return audit events newer than the last poll, oldest-first.

• read_audit_trail

  Query the linked filespace's audit trail (NDJSON under .lucid_audit/).

• read_file
• read_lines

  Read a line-range from a text file.

• register_account

  Register a minted credential as a named account for THIS session.

• register_data_store

  Register a data store on the linked filespace.

• release_file

  Release a previously claimed file (companion to ``claim_file``).

• search_replace

  sed-style find-and-replace within a single text file.

• subscribe_changes

  Open a cursor on audit events under a path prefix of the CURRENT filespace.

• sync_filespace

  Flush all pending writes to the hub, making them durable and visible to other clients. Call this after ``write_file(sync=false)`` batches; unsynced writes are lost if the session ends before a sync.

• tree

  Map the directory hierarchy, grouped under full directory paths.

• truncate_filewrite action

  Truncate or extend an existing file to exactly ``size`` bytes.

• unlink_external_filewrite action

  Remove an external-file link from the filespace.

• unlink_filespace

  Detach ONE linked filespace (the current one when ``name`` is omitted); other links stay live.

• unlock_byte_range

  Release a byte-range lock and close the underlying handle.

• unregister_accountwrite action

  Drop a session-registered account (the inverse of ``register_account``).

• unregister_data_storewrite action

  Remove (unregister) a data store from the linked filespace.

• unsubscribe_changes

  Close a subscription's cursor (on whichever filespace it lives).

• update_external_urlwrite action

  Repoint an existing HTTP/HTTPS external-file link to a new URL.

• use_account

  Switch the current account for subsequent tool calls.

• verify_token

  Check whether the CURRENT account's LucidLink token is accepted.

• whoami

  Return the current agent's identity and session state.

• write_atwrite action

  Overwrite bytes at a byte ``offset`` in an existing file, preserving the rest.

• write_filewrite action

  Write file content to the linked filespace.

• Code scan49 source files scanned25/25
• –Live reliabilityno gateway calls yet and no remote to proben/a
• –Tool poisoningtools not inspected (local package is not executed); not countedn/a
• Auth qualitystatic API keys via environment variables6/15
• Maintenancerepository not readable: unknown3/15
• Maintainer identityverified namespace with website, no repo4/10

Safety score

58/100

higher than 11% of 3,470 Web search servers

Tools

47

the typical Web search server has 5

Tools that change things

19%

typical: 0%. Fewer write tools means less an agent can break

Downloads a week

392

more than 81% of 827 Web search servers with a package

LucidLink: common questions

Is LucidLink MCP server safe?

With care: it is graded C, so read the findings first (58/100). Read the LucidLink safety report

How do I install LucidLink?

It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.

Does LucidLink need an API key?

Yes. The registry entry asks for LUCIDLINK_TOKEN.

Is LucidLink maintained?

The latest release is v1.0.1.

What can I use instead of LucidLink?

Servers from other publishers that do the same job: Repomix MCP server, LetsFG — Flights & Hotels MCP server and ThoughtDAG MCP server.

How does LucidLink compare with other Web search MCP servers?

safety score 58/100 (higher than 11% of 3,470 Web search servers); tools 47 (the typical Web search server has 5); tools that change things 19% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.