# Changelog

All notable changes to patterm are tracked in this file. Format follows
[Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and the project
loosely follows [Semantic Versioning](https://semver.org/spec/v2.0.0.html).

## [Unreleased]

### Added
- Ctrl+A / Ctrl+D step focus between top-level tabs; Ctrl+W / Ctrl+S
  step through processes (root + sub-agents) inside the current tab.
  Recognised in legacy, kitty CSI u, and xterm modifyOtherKeys
  encodings. The chord shadows the corresponding raw byte for the
  focused pane — pressing Ctrl+D no longer sends EOF to the
  underlying shell, for instance.
- MCP protocol layer (`internal/mcp/protocol.go`) implementing
  `initialize`, `tools/list`, `tools/call`, `ping`, and MCP
  notifications. Tool catalog with input schemas is advertised via
  `tools/list`. Real MCP clients (claude, etc.) can now complete the
  handshake against patterm's per-PID socket. Legacy direct-tool
  dispatch is preserved so the harness keeps working unchanged.
- `mcp_injection.kind = "cli_override"` for agents that accept inline
  `key=value` config overrides on the command line. The default codex
  preset uses it to emit `-c mcp_servers.patterm.command=…` and
  `-c mcp_servers.patterm.args=[…]` — zero files written, no
  `CODEX_HOME` override.
- `mcp_injection.kind = "config_env"` for agents that read their
  config from an env var. The default opencode preset uses it to pass
  a merged `opencode.json` inline through `OPENCODE_CONFIG_CONTENT`,
  so auth/agents/tui.json/skills resolve from the user's real `$HOME`
  with no XDG override.
- Palette macros: typing `sw `, `k `, or `sp ` filters the list to
  switch / kill / spawn entries respectively. Footer shows the
  available macros.

### Changed
- Palette ordering: open agents/processes (`Switch to …`) now appear
  above the option to spawn new ones, with kill entries pushed down
  toward the end of the list.
- Tab bar trimmed from three rows (label / subtitle / underline) to
  two (label / underline). Tabs flex to fill the available host width
  evenly with leftover columns distributed to the leftmost tabs; the
  `+ new` hint sits in a reserved slot on the right. Layout's
  `mainTop` consequently drops from 4 to 3, giving each pane one
  extra row of viewport.

### Fixed
- Child processes spawned by an orchestrator are now killed when the
  orchestrator dies, recursively through the tree. Applies whether the
  parent was closed via MCP, Ctrl-C'd by the user, or exited on its
  own — `reapChild` cascades a SIGTERM (escalating to SIGKILL after 2s)
  to every direct child, and each descendant's own reap fires the same
  cascade so the kill flows through arbitrary depth.
- Killed agents no longer linger in the command palette. Agent
  entries that aren't running are filtered out of the switch list;
  session-persistent commands (which can be restarted) stay visible.
- `tools/list` now emits a concrete `properties` object (`{}`) for
  parameterless tools instead of `null`. Claude rejected the
  `null`-properties form with "tools fetch failed" even though the
  initialize handshake had succeeded.
- Sidebar no longer flickers on every PTY chunk. The tab bar,
  sidebar, and status line now cache their last rendered byte string
  and skip the write when the new frame matches; full repaint paths
  (resize / focus change / palette close / screen clear) invalidate
  the cache so the next draw fires unconditionally.
- Spawning a child agent now clears the viewport area before it
  paints, so the previous focused child's PTY output no longer bleeds
  through underneath the new pane.
- Orchestrator-injected input (initial agent prompts, MCP
  `send_input` with `submit: true`, `send_message`, `timer_wait`
  callbacks) now ends with CR (`\r`) instead of LF (`\n`). Claude
  treated `\n` as "newline in textarea"; with CR the prompt actually
  submits, matching what the host terminal sends when a user presses
  Enter directly.
- Enter is now written to a child PTY as its own `write()` call,
  separated from the preceding text by a short delay. Both
  `InjectAsUser` (user typing forwarded through patterm) and
  `InjectAsOrchestrator` (MCP / send_message / initial-prompt paths)
  share the split. Without it, claude — and other paste-detecting
  TUIs — coalesced `"hello\r"` into one read and inserted the CR as
  literal text instead of treating it as the Enter keystroke.
- Sidebar (and tab bar) no longer get wiped when the focused child
  issues `CSI 0 J` / `CSI 1 J` (clear-to-cursor). The viewport renderer
  already clamped `CSI 2 J` and `CSI K` to viewport columns, but the
  partial-screen variants were forwarded verbatim, so any tool-call
  expansion in claude (Ctrl+O) would erase every cell to the right of
  the cursor — including the right rail. Both forms are now translated
  into per-row ECH sequences that stop at the viewport's right edge.
- Sidebar left border no longer vanishes when the viewport repaints.
  The border column was the same column as the viewport's rightmost
  cell, so any child write to that column (or `clearViewport`'s ECH)
  would erase it. The viewport is now one column narrower so the
  border has a dedicated column.
- Sidebar session-tree entries no longer get pushed downward when an
  agent emits a scroll burst on startup. Codex (Ratatui) issues 8× RI
  (`\x1bM`) right after setting its scroll region, which scrolls the
  region down across every column — dragging the right-rail entries
  with it. The chrome cache then hid the clobber because the computed
  frame still matched. The viewport renderer now flags any chunk that
  contains a scroll-triggering escape (RI / IND / NEL / SU / SD / IL /
  DL) and `OnPTYOut` drops the sidebar cache when the flag is set, so
  the next `drawSidebar` repaints over the drift.

## Conventions

- This file is the single record of user-visible changes; the TODO is
  scratch space, not history.
- One bullet per change, written in the past tense from the user's
  point of view. Reference the package or preset name when it helps a
  reader find the code.