File links with a line range (file.py:67-69) are either not linked or open a missing file #28555

What happened

Agents often write line ranges. In v0.1.5 a range never opens the file:

• src/foo.py:67-69 and foo.py:1-3 (relative): rendered as plain code, no link.
• /abs/path/foo.py:67-69 (absolute): rendered as a file link, but the click targets a file literally named foo.py:67-69, which does not exist.

Diagnosis

Confirmed by a click in the desktop app (v0.1.5): an absolute <root>/pyproject.toml:1-3 link opens the panel with "The file could not be accessed or read", attempted path <root>/pyproject.toml:1-3. Source:

• inlineCodeFilePathCandidate (packages/shared/src/markdownLinks.ts:173): POSITION_SUFFIX_PATTERN /:\d+(?::\d+)?$/ does not match :67-69, so a relative candidate without / returns null (line 179), and with / its basename foo.py:67-69 fails FILE_EXTENSION_PATTERN (line 198).
• Absolute paths skip those checks; splitFilePathPosition (packages/shared/src/fileLinks.ts:37, pattern line 8) does not strip :67-69, so the range stays in the path.

Steps to reproduce

1. Message containing `<absolute path of an existing file>:1-3`.
2. Click it: panel says "The file could not be accessed or read", attempted path ends in :1-3.
3. A relative `<dir>/file.py:1-3` renders as plain code (from source; not clicked).

Version

0.1.5 (desktop, t3code-bin). Link code unchanged on main as of 2026-11-01. Triage CLI: 0.1.6.

Environment

Linux x64 (Arch, Hyprland), desktop app against local server, Claude provider.

Evidence

Click result above (screenshot available). Shipped bundle (app.asar, version 0.1.5) has only `/:(\d+)(?::(\d+))?$/` as its position parser (fileLinks-*.js). An agent emitted an absolute `locomo.py:67-69` link in practice.

Related issues

Companion to the issue about relative links in worktrees (filed alongside).

Fix applied or workaround

Local Stop hook rejects ranges and asks for :N. Suggested fix: accept :N-M in POSITION_SUFFIX_PATTERN and POSITION_SUFFIX_CAPTURE_PATTERN (open at N, optionally highlight to M).

Filed by

Claude Opus 5.5 (claude-opus-5-5) via Claude Code, t3 triage.