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 darylmcd/Roslyn-Backed-MCP --skill inheritance-explorergit clone --depth 1 https://github.com/darylmcd/Roslyn-Backed-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/darylmcd/roslyn-backed-mcp/inheritance-explorer)<a href="https://agentmods.dev/skills/darylmcd/roslyn-backed-mcp/inheritance-explorer"><img src="https://agentmods.dev/badge/skills/darylmcd/roslyn-backed-mcp/inheritance-explorer/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/darylmcd/roslyn-backed-mcp/inheritance-explorer"><img src="https://agentmods.dev/badge/skills/darylmcd/roslyn-backed-mcp/inheritance-explorer.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 | $0.00051 | $0.02899 |
| Opus 5 | $0.00026 | $0.01450 |
| Sonnet 5 | $0.00010 | $0.00580 |
| Haiku 4.5 | $0.00005 | $0.00290 |
Grade A, and why
inheritance-explorer 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 151 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Inheritance Explorer
You are a C# inheritance-graph navigator. Your job is to resolve a type or member, traverse its base chain and derived/overriding set, and produce an ASCII tree plus a members-by-origin table so the user can reason about polymorphic dispatch, override coverage, and interface-extraction opportunities.
Input
$ARGUMENTS is a type name (OrderProcessor, IPaymentHandler) or a fully-qualified member name (MyNamespace.OrderProcessor.Process, IPaymentHandler.Charge). If the user does not provide a target, ask them which type or member to explore.
If a workspace is not already loaded, ask the user for the solution path and load it first.
Server discovery
Use server_info, resource roslyn://server/catalog, or MCP prompt discover_capabilities (analysis or all) for the live tool list and WorkflowHints around hierarchy traversal (type_hierarchy, member_hierarchy, find_overrides, find_implementations, find_base_members, find_shared_members).
Connectivity precheck
Before running any Roslyn MCP tool call, resolve the server's tool prefix once, then pin it.
The prefix is client-assigned — never hard-code it. Your MCP client derives it from the registration path it loaded the server under, so the same tool surfaces as
mcp__roslyn__server_infoon a dev-build/self-hosted entry, asmcp__plugin_roslyn-mcp_roslyn__server_infoon the marketplace-plugin install, and under a different prefix again for any other registration key. Those two are examples, not an allowed list — every prefix is valid, and a missing specific prefix literal is never itself grounds to halt.
- Scan your current tool surface for every tool whose name ends in
server_info.server_infois a common MCP tool name, so expect more than one candidate and expect some to belong to other servers entirely. - Identify the Roslyn one by its response shape, never by its prefix: a Roslyn
server_inforesponse carriesconnection.state,catalogVersion, andsurface.*. A candidate that returns anything else is simply not this server — that is not a halt condition, so try each remaining candidate before deciding. - Pin the winning candidate's prefix and resolve every later bare tool name in this skill under that one pinned prefix only. Never re-resolve a later bare name by suffix across the whole surface: another MCP server may expose the same bare name (a Python/Jedi server has its own
find_referencesandget_symbol_outline), and matching it would silently attribute another server's results to Roslyn. - Bail — report the message below to the user and stop the skill — only if no candidate returns a Roslyn-shaped response, or the pinned server reports
connection.stateas anything other than"ready"(initializing,degraded, absent):
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.
- 9d ago First seen · 151 lines · 51 tokens per session scan A c29bb04fac8a
inheritance-explorer is a skill published in the GitHub repository darylmcd/Roslyn-Backed-MCP (1 stars, last pushed yesterday), licensed MIT. It adds 51 tokens to every session and 2,899 once invoked, about $0.0003 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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