| FMRS | 60 / 100 · C | 75 / 100 · B |
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| Reliability | 8 / 20 | 12 / 20 |
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| Security and permissions | 11 / 20 | 16 / 20 |
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| Maintenance | 15 / 20 | 14 / 20 |
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| Documentation | 14 / 20 | 18 / 20 |
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| Setup experience | 12 / 20 | 15 / 20 |
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| Best for | - Individuals or teams who want to read/search/organize/send email directly from an MCP client
- Users with multiple IMAP/SMTP accounts who want unified management
- Users comfortable with uv/uvx and local credential setup who can configure their own mail accounts
| - Individuals or teams who prioritise privacy and offline operation and do not want data leaving the machine
- Users who share memory across multiple MCP clients such as Claude Code, Claude Desktop, Hermes Agent, OpenClaw, Cursor, Codex and Gemini CLI
- Scenarios that need encrypted storage, a hash-chained audit log and verifiable vault migration
- Users who want low-latency recall, a bundled embedding model and no extra LLM calls inside the memory layer
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| Not for | - Users unwilling to store email passwords/credentials locally
- Setups requiring OAuth (e.g., modern Gmail/Outlook auth) rather than username/password login, which the source material does not confirm is supported
- Users wanting a fully cloud-hosted email service with no local configuration
| - Users who need cloud multi-device sync or a hosted team memory service; moving between machines means locking the vault and copying the file
- Users who expect the server itself to run an LLM that extracts facts and decides what to remember; Compartment explicitly keeps no LLM inside and leaves that to the host model
- Users who cannot keep a passphrase safe or who need a recovery path if it is lost, since Compartment never generates a password, seed or recovery phrase
- Deployments that require network transports such as SSE or streamable-http; this server is stdio only and opens no ports
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| Required permissions | - Stores and uses email account credentials (username/password) in local keyring or managed SQLite storage
- Reads and searches mailbox content via IMAP
- Sends email on the user's behalf via SMTP
- Local filesystem access to read/write configuration (TOML file or SQLite database)
| - Read and write the vault file under the user's home directory, by default ~/.compartment/memory.vault, and its sibling settings file
- Access the session directory holding the unlock credential (configurable with COMPARTMENT_SESSION_DIR), which also carries the shared embedding process's Unix socket
- Optionally use the macOS keychain (compartment unlock --keychain is an explicit opt-in, and it survives reboots)
- Write or merge an mcpServers entry into each MCP client's own configuration file, taking a byte-exact backup first
- Install a PostToolUse hook for Claude Code that captures memory files the agent writes
- Serve a read-only dashboard on 127.0.0.1 behind a one-time random URL token
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| Risks and side effects | - Email credentials are stored locally (legacy TOML/keyring, or managed SQLite in V2); exposure of this storage could allow unauthorized mailbox access
- Granting an AI client the ability to send email creates risk of unintended or malicious sends via prompt misuse
- Migrating from legacy configuration to V2 involves credential import, which can hit conflicts or missing-credential issues if done incorrectly
| - A leaked passphrase means the encrypted content can be decrypted; Compartment generates no recovery phrase and cannot recover a lost passphrase
- Enabling the memory_unlock tool places the passphrase in the model's context, which is why it is off by default
- If a 2FA keyfile is lost, for example a USB stick, the vault cannot be opened even with the passphrase
- `export --plaintext` writes the vault as unencrypted JSONL, so that file must be handled carefully
- Memory content can come from untrusted sources; recall wraps memories with a notice that they are stored data and content can be marked quarantined, but the host agent must still treat memory as data to limit prompt-injection risk
- The capture hook and client integration write into the user's own settings files, although the implementation backs up and merges rather than replacing
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| Supported clients | | Claude Desktop, Claude Code, Hermes Agent, OpenClaw, Cursor, VS Code, Codex, Gemini CLI, Cline, Roo Code, Zed, OpenCode, LM Studio, AnythingLLM, BoltAI, Goose, Kiro |
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| Tools | 0 | 14 |
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