Kyle Carberry
d11849d94a
Context files (AGENTS.md) and skills were only fetched from the
workspace on the first turn or when the agent changed. On subsequent
turns, stale content from persisted messages was used. This meant that
if AGENTS.md or skills were modified on the workspace between turns, the
agent wouldn't see the changes until the user created a new chat.
## Changes
- Extract `fetchWorkspaceContext` from `persistInstructionFiles` to
allow fetching workspace context without persisting
- On subsequent turns, re-fetch fresh context from the workspace instead
of reading stale persisted content; falls back to persisted messages if
the workspace dial fails
- Update `ReloadMessages` callback to re-derive instruction and skills
from reloaded database messages after compaction, instead of using
captured closure variables
- Add `formatSystemInstructionsFromParts` helper to build system
instructions directly from agent parts without requiring separate
OS/directory params
- Add tests for the new helper
<details><summary>Implementation Notes</summary>
### Root cause
In `runChat`, the `else if hasContextFiles` branch (subsequent turns)
called `instructionFromContextFiles(messages)` which read stale content
from persisted DB messages. The `ReloadMessages` callback
(post-compaction) also used captured `instruction`/`skills` closure
variables from the start of the turn, never re-deriving them.
### Approach
1. **Extract `fetchWorkspaceContext`** — Pure refactor of the fetch-only
part of `persistInstructionFiles` (agent connection, context config
retrieval, content sanitization, metadata stamping). Returns parts +
skills without persisting.
2. **Subsequent turns**: Instead of reading from persisted messages,
launch a `g2` goroutine that calls `fetchWorkspaceContext` to get fresh
context from the workspace. Falls back gracefully to persisted messages
if the workspace is unreachable.
3. **ReloadMessages**: Re-derive `instruction` from
`instructionFromContextFiles(reloadedMsgs)` and `skills` from
`skillsFromParts(reloadedMsgs)` using the freshly loaded messages, with
fallback to captured values if the reloaded messages don't contain
context (e.g. compacted away).
</details>
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