feat: Support auto-completion for file names

[Troyanovsky]

What feature would you like to see?

In Claude Code, when you input

• /, it will suggest auto completion for skill name
• @, it will suggest auto completion for file name

But for Hapi, when I control a remote Claude Code session with my mobile browser. It's not suggesting auto-completion. Typing the full skill name or file name is especially difficult on mobile.
I see that Hapi is already having a file browsing feature so I assume it knows all file names, thus auto-compete is possible?

Additional information

No response

[github-actions]

Thanks for the request. Verified in the current codebase: this is partly implemented, but not in the Claude Code-compatible way you described.

Current behavior from code:

• The web composer already has autocomplete UI and detects @, /, and $ prefixes.
• Skill suggestions are currently wired to $<skill-name>, not / <skill-name> or /<skill-name>.
• / is wired to slash-command suggestions.
• @ is detected by the composer/parser, but I did not find a file-suggestion provider connected to it. Because the router sends every non-$ query to slash-command suggestions, @foo currently falls through to slash-command lookup.
• HAPI already has session file search/listing APIs, so the file data needed for @file completion exists on the web/hub/CLI path.

So this looks like a valid enhancement: wire @ to session file search results, and decide whether skills should be exposed through Claude-compatible /skill completion, current $skill, or both.

Relevant code:

• web/src/components/AssistantChat/HappyComposer.tsx:106 - composer autocomplete prefixes include @, /, and $.
• web/src/router.tsx:339 - autocomplete router only sends $ queries to skills; all other prefixes go to slash commands.
• web/src/hooks/queries/useSkills.ts:57 - skill suggestions are returned as $${skill.name}.
• web/src/hooks/queries/useSlashCommands.ts:66 - slash-command suggestions are returned as /${cmd.name}.
• hub/src/web/routes/git.ts:133 - session file search endpoint exists and uses rg --files with an optional query filter.
• web/src/hooks/queries/useSessionFileSearch.ts:21 - web hook already calls the session file search API.
• hub/src/web/routes/sessions.ts:512 - session skills endpoint exists.
• cli/src/modules/common/skills.ts:158 - CLI lists project/user/admin skill roots and returns sorted skill names.

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HAPI Bot

[Troyanovsky]

I guess the $ for skills and / for built-in slash commands works.
So it just leaves a gap for file name auto-completion. When working in a code base with many files that may have similar names, my prompt needs to be exact to point the agent to the file. But remembering and typing out full file names without auto-complete becomes a real pain point.