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 skills add myelixlabs/synapse-mcp --skill impactgit clone --depth 1 https://github.com/myelixlabs/synapse-mcpWrote 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/skills/myelixlabs/synapse-mcp/impact)<a href="https://agentmods.dev/skills/myelixlabs/synapse-mcp/impact"><img src="https://agentmods.dev/badge/skills/myelixlabs/synapse-mcp/impact/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/myelixlabs/synapse-mcp/impact"><img src="https://agentmods.dev/badge/skills/myelixlabs/synapse-mcp/impact.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00054 | $0.00289 |
| Opus 5.5 | $0.00022 | $0.00116 |
| Sonnet 5.5 | $0.00011 | $0.00058 |
| Haiku 4.5 | $0.00005 | $0.00029 |
Grade A, and why
impact 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 7d 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
Impact of changing a symbol
The symbol is $ARGUMENTS. If it is empty, ask the user which function, class or module they mean.
- Find the
repo_idfor the current project withsynapse_manage_repos(actionlist), matching on the project directory. If the project is not registered, stop and suggest/synapse-mcp:index. - If the name could match more than one definition, call
synapse_search_codebasewith actionsymboland ask the user to pick. For Elixir, include the arity, for exampleParser.parse/2. - Call
synapse_change_reviewwith actionimpact, the symbol and therepo_id. - Report: direct callers, callers further out, the files involved and the tests that cover them. Finish with a one-line judgement of how risky a change is.
If Synapse answers that this needs a Pro licence, say so plainly and point the user to https://synapse-mcp.dev/download. Do not retry or work around it.
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.
- 7d ago First seen · 17 lines · 54 tokens per session scan A 430b0c884bd4
impact is a skill published in the GitHub repository myelixlabs/synapse-mcp (3 stars, last pushed 6d ago), licensed MIT. It adds 54 tokens to every session and 289 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-30.
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