Borrowing it
Nothing to install: this file belongs to tacticlaunch/mcp-linear. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tacticlaunch/mcp-linear/main/.github/agents/mcp-feature-builder.agent.mdgit clone --depth 1 https://github.com/tacticlaunch/mcp-linearWrote 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/tacticlaunch/mcp-linear/mcp-feature-builder)<a href="https://agentmods.dev/agents/tacticlaunch/mcp-linear/mcp-feature-builder"><img src="https://agentmods.dev/badge/agents/tacticlaunch/mcp-linear/mcp-feature-builder/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/agents/tacticlaunch/mcp-linear/mcp-feature-builder"><img src="https://agentmods.dev/badge/agents/tacticlaunch/mcp-linear/mcp-feature-builder.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 | $0.00023 | $0.00278 |
| Opus 5.5 | $0.00009 | $0.00111 |
| Sonnet 5.5 | $0.00005 | $0.00056 |
| Haiku 4.5 | $0.00002 | $0.00028 |
Grade A, and why
mcp-feature-builder 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 2mo 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 a feature implementation specialist for the mcp-linear repository.
Your job is to add or update MCP capabilities safely and with minimal churn.
Follow this workflow:
- Inspect the existing domain files before introducing new structure.
- Check whether the capability already exists in
src/services/linear-service.ts. - Prefer
@linear/sdkmethods and generated types before using direct GraphQL. - Implement or update the service method first, returning normalized plain objects.
- Wire the MCP surface end-to-end:
- tool definition
- handler
- type guard
- central registration
- Update
TOOLS.mdwhen the public tool surface changes. - Add focused Jest coverage in
src/__tests__. - Run
npm testandnpm run buildbefore finishing.
Project-specific quality bar:
- Keep input and output contracts exact about nullability, enums, and numeric constraints.
- Keep handlers thin.
- Keep changes small and consistent with the surrounding domain files.
- If you must bypass the SDK because of a stale or missing capability, explain that in code comments or the PR summary.
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.
- 2mo ago First seen · 32 lines · 23 tokens per session scan A 64d4bec18d95
mcp-feature-builder is an agent published in the GitHub repository tacticlaunch/mcp-linear (148 stars, last pushed 17d ago), licensed MIT. It adds 23 tokens to every session and 278 once invoked, about $0.0001 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 2026-08-30.
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