#3150 reworded write_file's description, overwrite parameter, and guard
error to prefer append_file/edit_file. But those tools register via their
own enable flags and the per-agent allowlist, so a config exposing only
write_file was steered toward tools it does not have — a dead end in the
most restrictive setups.
WriteFileTool now tracks which non-destructive alternatives are available
and names only the ones present; when none are, the guard still blocks the
overwrite without pointing anywhere. The agent wiring registers the editors
before write_file and resolves availability via registry.HasRegistered,
which reflects both the enable flag and the allowlist.
Tests: conditional copy at the tool level (none/one/both) and agent wiring
across the enable-flag and allowlist dimensions.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The overwrite guard error ("Set overwrite=true to replace") steered the
model to clobber files like MEMORY.md. Reword write_file's description,
overwrite param, and guard error to prefer append_file/edit_file.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
