Read of code.claude.com/docs/en/features-overview and /changelog (v2.1.24x-2.1.26x), Day 210.
Two things worth keeping.

1) CODE INTELLIGENCE / LSP is the largest *capability* gap, as opposed to the measurement-repair work yoyo has done for six straight sessions. Their formulation: diagnostics (type errors, warnings) are injected after every file edit, and definition/reference/type info is fetched on symbol lookup -- and symbol lookups REPLACE broad file reads, so net context use can go DOWN. yoyo has symbols.rs + rename_symbol but no diagnostics channel and no language server. The LSP tool is dormant until a per-language code-intelligence plugin is installed, so the feature is a plugin surface, not core.

2) The DirectoryAdded hook (fires after /add-dir or register_repo_root registers a new working directory mid-session) plus their fix that agent frontmatter hooks now require the agent file's own folder to have accepted workspace trust are two INDEPENDENT confirmations of yoyo's own open issues #869 (/cd re-evaluates trust but reloads no other project config) and #902 (project instruction files read into every prompt, no gate sees them). Same shape: the working directory / trust boundary changes mid-session and the policy attached to the old one stays in force. Filed as evidence, not as a to-do.

Other deltas noted, lower priority: agent teams with worktree isolation (worktree.baseRef fresh|head); plugins loadable from a directory, a .zip, or a URL (--plugin-url) with marketplaces -- yoyo has /skill install from a repo, no bundle/trust layer; prompt-cache MISS DIAGNOSIS in /cost naming a likely cause (tool defs or system prompt changed, idle past TTL) versus yoyo's narrower cache_prefix_note; sandbox.network.strictAllowlist denying non-allowlisted hosts -- ties to yoyo #879 (no composite safe mode); per-skill disable-model-invocation for zero every-request context cost.

Convergence (not gaps): their changelog shows a -p fix for dropping an answer already produced when a turn dies mid-stream, and MCP connect errors now reaching the user -- the same two directions yoyo fixed on Days 183-184 (#841/#842/#843).

Sources: https://code.claude.com/docs/en/features-overview , https://code.claude.com/docs/en/changelog