Two services aimed at Copilot Pro+ users (Chat / Agent / Workspace). Card 1 cuts the premium-request waste from hallucination loops — your agent stops inventing APIs and re-reading the same files turn after turn. Card 2 runs a 9-perspective red-team audit before merge. Honest scope below.
GitHub Copilot Pro+ runs on a premium-request budget: 1500 / month included, $0.04 each over. Agent mode + Workspace + Chat all draw from the same pool. Each hallucination loop — "call user.send_email" → error → "actually call user.email" — eats a premium request that did zero net work.
The math: a single 5-turn correction cycle = 5 premium requests = $0.20. Multiply by 20 agent sessions a week. That's $16/mo evaporating on what should have been a free symbol_exists check.
Card 1 puts that check inside the Copilot agent's tool catalog (MCP-native), AND wires hooks / rules that fire automatically — so the agent doesn't have to remember to use it.
ArgosBrain runs as an MCP server. Copilot Agent + Workspace + Chat all support MCP. Add ArgosBrain to your MCP config; the Copilot agent gets 15 default tools (preflight, callers, check_reachability, symbol_exists, resolve_member, verify_no_fake_done, plus security primitives + operational).
The MCP instructions field auto-applied tells the agent: "BEFORE writing code that references / renames / deletes a named symbol, call mcp__argos__preflight." Compliance ~90-95% on GPT-4.1 / Claude 3.5 Sonnet (Copilot's underlying models). When the agent calls preflight, it gets existence + caller count + risk verdict — no more invented APIs, no more callers broken in silence.
After every edit: verify_no_fake_done scans for stub patterns. Hit → agent obligated to fix before claiming "done". Cuts the "declared finished but actually a stub" failure mode that Copilot Agent is known for.
/argos-security.Type /argos-security in Copilot Chat. Nine attacker perspectives run in parallel — Recon, Web/API, Cloud, AI/LLM, Supply-chain, Build & Release, Forgotten Attack Surface, Surface Drift Watch (every new endpoint since last release flagged for missing auth middleware — perfect for PR review), Privilege Boundary Leaks. Composed into MITRE ATT&CK-mapped kill chains.
30-50 min on a 50k LOC codebase. Static control-flow only — PoC pseudocode for your team's verification, no live exploits. Output: a markdown report you paste in the PR description as evidence "this PR was security-reviewed structurally before merge". Nine perspectives in detail →
We do improve Copilot Chat, Copilot Agent mode, Copilot Workspace — anywhere the agent makes MCP tool calls and the LLM reasons over the response.
We do not touch inline Tab completion. That ships inside Microsoft's editor process; it doesn't go through MCP; there's no place to hook into. If your problem is "inline Tab suggests bad code", ArgosBrain doesn't fix it. We're honest about that.
Bottom line: if your Copilot Pro+ premium-request bill is dominated by agent + chat + workspace usage (the typical case for Pro+ users — that's why you upgraded from Business), the math works. If you're a pure inline-Tab user on Copilot Business, ArgosBrain isn't your fit yet.
argosbrain init. MCP wires automatically.curl -fsSL https://argosbrain.com/install.sh | sh cd ~/my-project argosbrain init --install-config .
Detects Copilot (via ~/.vscode/extensions/github.copilot-* or VS Code MCP settings), writes the MCP config, ingests your repo. Restart VS Code. The Copilot agent now has 15 default tools, ARGOS PROTOCOL in its system prompt, and /argos-security available in chat.
ArgosBrain runs entirely on your machine. Ingestion, storage, retrieval, hooks — all local. No cloud round-trip. No telemetry on the code path. The Copilot agent does still talk to GitHub's servers for the LLM itself — that's its architecture, not ours. But the code verification ArgosBrain provides? Local.
If you turn ArgosBrain off, Copilot falls back to whatever it did before. No lock-in. Solo tier is free.
Get your free key → · The two services in detail · The two default skills · vs Copilot Workspace · Independent verdict