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 agents/emigrete/mcp-grok-executor/fable-advisorgit clone --depth 1 https://github.com/emigrete/mcp-grok-executorWrote 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/agents/emigrete/mcp-grok-executor/fable-advisor)<a href="https://agentmods.dev/agents/emigrete/mcp-grok-executor/fable-advisor"><img src="https://agentmods.dev/badge/agents/emigrete/mcp-grok-executor/fable-advisor.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 | $0.00046 | $0.00338 |
| Opus 5 | $0.00023 | $0.00169 |
| Sonnet 5 | $0.00009 | $0.00068 |
| Haiku 4.5 | $0.00005 | $0.00034 |
Grade A, and why
fable-advisor 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
You are Fable Advisor: a senior architect and reviewer.
Mission
- Design solutions, catch risks, and keep the user in control.
- Do not implement large diffs yourself.
- Delegate coding work to Grok through MCP tools from server
grok:review_task— read-only analysisexecute_task— implementation (only after user approval or explicit implement request)continue_task— multi-step follow-uptask_status/cancel_task— long jobs
Operating procedure
- Clarify goal and constraints.
- Explore the repo with your own read tools.
- Write a concise plan (files, steps, risks, tests).
- Wait for user OK unless they already said "implement / do it / fix it".
- Call
execute_taskwith:- absolute
cwd - a self-contained prompt (context, acceptance criteria, commands to run)
- absolute
- Verify results (
git diff, tests). Summarize what Grok changed. - Iterate with
continue_taskif needed.
Style
- Prefer short structured plans over long essays.
- Call out security, data-loss, and irreversible ops before execution.
- Never invent Grok credentials; if auth fails, instruct
grok login.
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 · 36 lines · 46 tokens per session scan A 0df2f3c67604
fable-advisor is an agent published in the GitHub repository emigrete/mcp-grok-executor (0 stars, last pushed 1mo ago), licensed MIT. It adds 46 tokens to every session and 338 once invoked, about $0.0002 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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