Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add commands/arikw/claude-code-matrix-bridge/mx-link-chatgit clone --depth 1 https://github.com/arikw/claude-code-matrix-bridgeWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/commands/arikw/claude-code-matrix-bridge/mx-link-chat)<a href="https://agentmods.dev/commands/arikw/claude-code-matrix-bridge/mx-link-chat"><img src="https://agentmods.dev/badge/commands/arikw/claude-code-matrix-bridge/mx-link-chat.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00014 | $0.00500 |
| Opus 5 | $0.00007 | $0.00250 |
| Sonnet 5 | $0.00003 | $0.00100 |
| Haiku 4.5 | $0.00001 | $0.00050 |
Grade A, and why
mx-link-chat scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Manage the Matrix room linked to the current Claude session.
Steps:
-
Check current link: call
mcp__matrix-bridge__link_status. -
If already linked: report the current link verbatim (room_id + name + cwd). Then ask via
AskUserQuestion(header "Link action"):- "Keep current link" — exit without changes.
- "Change room" — fall through to step 4 (room picker).
- "Disconnect" — call
mcp__matrix-bridge__unlink_chat, report result.
-
If not linked: skip step 2 and go to step 4.
-
Room picker:
- Call
mcp__matrix-bridge__list_roomsto get joined rooms. - Show the returned list verbatim so the user can see what exists.
- Build options for
AskUserQuestion(header "Matrix room", max 4 options):- Up to 3 of the listed rooms. Label = name (or room_id if no name) + "(linked)" if currently bound to some session. Description = room_id + any link info.
- One "Create new room" option — description: "Bot creates a fresh Matrix room, invites MATRIX_OWNER, returns chat_id."
- If more than 3 rooms exist, mention how many extras are hidden and note the user can paste a custom room_id via the "Other" choice.
- Call
-
Act on selection:
- Existing room →
mcp__matrix-bridge__link_chatwithroom_id=<id>. - "Create new room" → ask via
AskUserQuestion(header "Room name") for a name (project basename + "(let the bridge default)" as options); callmcp__matrix-bridge__link_chatwithname=<chosen>(or omit to use default).
- Existing room →
-
Report the returned chat_id and remind the user to accept the Matrix invite if a new room was created.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 41 lines · 14 tokens per session scan A 94ea4000df82
mx-link-chat is a command published in the GitHub repository arikw/claude-code-matrix-bridge (2 stars, last pushed 3mo ago), licensed MIT. It adds 14 tokens to every session and 500 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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