Imported from ognistik/ursus (AGENTS.md). Install upstream with npx skills add ognistik/ursus. Copyright stays with the author.

AGENTS.md

Read docs/MAINTAINER_NOTES.md before making substantial changes.

Project Identity

• Current MCP server name exposed to clients is ursus.
• Do not rename package targets, binary names, config paths, or MCP tool names unless the user explicitly asks for that migration.

Product Rules

• This is a Bear-specific local MCP server for macOS.
• Reads come from Bear's local SQLite database.
• Writes go through Bear's x-callback-url scheme.
• Do not write directly to Bear's SQLite database.
• Do not rebuild the old AppleScript/Shortcuts bridge into the new runtime.
• Do not turn the MCP surface into one giant bear_action tool.

Important User Preferences

• Batch operations are important. Prefer non-empty operations: [...] inputs for mutation tools that support batching.
• The old Alter schema and AppleScript bridge are reference material only and must not be modified.
• bear_replace_content should compute the full note text locally, then commit through Bear's full replacement path.
• That replacement flow may be used for title changes when the leading title markdown is changed.
• Discovery tools should return compact note summaries, while bear_get_notes remains the full-note fetch. Inbox-note discovery is driven by configured inbox tags.
• Mutation tools should return compact receipts, not full note bodies, unless the user explicitly asks for content.
• Bear's own trash/restore flows are intentionally excluded from the MCP surface for now. Backup restore remains available through bear_restore_notes.

Current Technical Direction

• Config and templates currently live under ~/Library/Application Support/Ursus.
• Create-note templates are currently single-file template.md, not separate header/footer files.
• The current read adapter is real and queries the installed Bear database schema.
• The current write adapter launches Bear URLs and uses best-effort DB polling for mutation receipts.
• The MCP server should run as a single instance; startup now takes a process lock to prevent stale concurrent servers.
• Runtime artifacts live under ~/Library/Application Support/Ursus.
• Debug tracing is written under ~/Library/Application Support/Ursus/Logs/debug.log with size-based retention.
• Sparkle update UI must remain owned by the app executable. Long-running ursus mcp / ursus bridge serve use a background SPUUpdater scheduler and only hand off to foreground Sparkle UI when an update is actually available.
• Background Sparkle checks must stay silent on "no update" and on updater errors. User-initiated checks may show Sparkle's normal "up to date" UI.
• Do not make ordinary one-shot CLI commands participate in scheduled Sparkle checks or advance SULastCheckTime.
• Do not add another helper app for update presentation. Preserve the current Sparkle-only foreground mode in the main app executable and the separation between bridge process ownership and update UI ownership.
• If you touch Sparkle, bridge lifecycle, launcher behavior, or multi-process app/CLI handoff, update docs/ARCHITECTURE.md and docs/MAINTAINER_NOTES.md in the same change and preserve the documented invariants.

Working Style

• Preserve the current layered structure: BearCore, BearDB, BearXCallback, BearApplication, BearMCP, BearCLIRuntime, BearMCPCLI.
• Prefer real implementation over stubs when local context is available.
• Keep docs and status files updated when architecture or scope changes.