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photocraft/book/src
Ahmed Hosny 3e3e580217 MCP bridge: reconnect before idle sockets die, retry reads, actionable timeouts (#2487) (#2507)
* MCP bridge: reconnect before idle sockets die, retry reads, actionable timeouts (#2487)

The app closes idle control connections after 30s (IO_TIMEOUT) while the
bridge kept one persistent connection, so the first call after a pause
failed with "operation may have completed". The bridge now drops and
reconnects before sending once the connection has been idle 25s, so a
request is never written to a socket the app may have dropped.

The default call timeout drops from 60s to 55s, strictly below the app's
60s reply deadline, so the bridge's own error — naming the method and the
likely causes — is the one callers see instead of a race between the
app's deadline reply and the caller's own cutoff.

Idempotent read methods (ui.inspect and friends) get one automatic retry
on a transport failure; edits keep #1007 semantics and are never resent.
A timed-out call is never retried (it would only double the wait).

* MCP bridge: caller-vouched read retries, per-failure wording, docs contract (#2487 review)

The retry decision moves from a hand-maintained method list — most of whose
entries were engine command ids that never travel as control-protocol
methods, so they could never match — to the call sites that know a call is
a read: call never resends (#1007), call_read retries once on a transport
failure, and the MCP server opts its pure-read tools in. Failures are
worded by what they prove: a connection that could never be established is
"the request was not sent", not "may have completed"; a read timeout says
a read may be retried safely instead of demanding a state inspection. The
55s client cap, the read-retry exception, and the idle reconnect are now
documented in the control protocol and the security book.
2026-10-11 08:29:35 -04:00
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PhotoCraft Documentation

PhotoCraft is a native image editor written in Rust. This book is the maintained entry point for installation, architecture, formats, automation, development, and security documentation.

The repository's existing docs/ directory remains authoritative for detailed design notes, parity reports, UI conventions, release procedures, and the complete control-protocol method reference. The book links to those documents instead of copying them.

Start here

Documentation for coding agents

Coding agents should read the following in order:

  1. AGENTS.md for repository rules and verification gates.
  2. README.md for product scope and current entry points.
  3. book/src/architecture/ for crate boundaries and command flow.
  4. book/src/automation/ before driving the CLI, control protocol, or MCP server.
  5. book/src/security/ before changing a parser, file I/O, automation, MCP, the control server, command execution, or serialization/deserialization.

Agents must treat document bytes, paths, command parameters, and automation messages as untrusted input. A page that describes a proposed control does not mean that control is implemented.

Status language

Security pages use four labels consistently:

  • Implemented: behavior confirmed in current source or tests.
  • Known limitation: an exposed risk or missing control in current source.
  • Proposed: a design direction that is not enforced by the current build.
  • Future hardening: useful follow-up work without an accepted implementation yet.