Compiler Explorer

REMOTE · GODBOLT.ORG · SCANNED AUG 20

Compile code with thousands of compilers, inspect the assembly, and share godbolt.org links

Available components

63 63 Trust /100

Trust breakdown (6 categories)

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score →

Endpoint Security57

The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
Authorisation not fully verified: no authorisation is required to call this server, and 6 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail

Transport & Reachability100

Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass

Schema Quality & AI Usability73

AI-judged instruction clarity (excellent).Pass
Context-footprint check failed: tool/resource definitions use about 1081 tokens (~154/item across 7 items; 7 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
Usage-examples check failed: none of the tools include examples. See how to fix → Fail

Stability & Change Management7

Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial

Tool Coverage100

100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
100% of tool parameters carry a description.Pass

Capabilities100

Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass

Install

Add this component to your MCP client. Where a client-specific snippet is available, pick your client below and copy it straight into your config; otherwise use the connection detail shown.

remote · godbolt.org

Claude Codex opencode OpenClaw Hermes Other

# add to Claude Code

claude mcp add --transport http compiler-explorer-compiler-explorer https://godbolt.org/mcp

# ~/.codex/config.toml

[mcp_servers.compiler-explorer-compiler-explorer]
url = "https://godbolt.org/mcp"

// opencode.json

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "compiler-explorer-compiler-explorer": {
      "type": "remote",
      "url": "https://godbolt.org/mcp",
      "enabled": true
    }
  }
}

# add to OpenClaw

openclaw mcp add compiler-explorer-compiler-explorer --url https://godbolt.org/mcp --transport streamable-http

# ~/.hermes/config.yaml

mcp_servers:
  compiler-explorer-compiler-explorer:
    url: "https://godbolt.org/mcp"

// mcp.json

{
  "mcpServers": {
    "compiler-explorer-compiler-explorer": {
      "type": "http",
      "url": "https://godbolt.org/mcp"
    }
  }
}

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

19 Aug 26 +1
- Stability: unverified → 0.03 ▲ functional
18 Aug 26 62

First indexed and scored.

Show 1 earlier entry Hide earlier entries

Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 20 Aug 2026 · Probed https://godbolt.org/mcp

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject	Issuer	Valid from	Valid until	Key	Signature	Serial
CN=godbolt.org	CN=Amazon RSA 2048 M04,O=Amazon,C=US	23 Jun 2026	6 Jan 2027	RSA 2048	SHA256-RSA	49c41206ff97537c9e6d5d263f83d0d
SANs: godbolt.org, .godbo.lt, .compiler-explorer.com, godbo.lt, compiler-explorer.com, *.godbolt.org
CN=Amazon RSA 2048 M04,O=Amazon,C=US (CA)	CN=Amazon Root CA 1,O=Amazon,C=US	23 Aug 2022	23 Aug 2030	RSA 2048	SHA256-RSA	773124f2a952e3ed18a58bdb85d1bc0ce5f27
CN=Amazon Root CA 1,O=Amazon,C=US (CA)	CN=Starfield Services Root Certificate Authority - G2,O=Starfield Technologies\, Inc.,L=Scottsdale,ST=Arizona,C=US	25 May 2015	31 Dec 2037	RSA 2048	SHA256-RSA	67f944a2a27cdf3fac2ae2b01f908eeb9c4c6

DNSSEC insecure

Validation of godbolt.org. — Not signed

Zone	DS	Keys	Algorithms	Outcome
.	trust_anchor	20326, 38696	8, 8	Verified
org.	present	26974	8	Verified
godbolt.org.	absent			Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation

Authentication No authorisation required

The endpoint answered without asking for a token. Anyone who knows the URL can reach it.

Result	No authorisation required
HTTP status	200

Transports 2 probes

Transport	URL	Outcome	Status	Location
streamable-http	https://godbolt.org/mcp	Verified	200
http (plaintext)	http://godbolt.org/mcp	HTTPS enforced	301	https://godbolt.org/mcp

MCP tools · 7 exposed · ~1,081 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability.

Tool Tokens

compile ~257

Compile source code and return assembly output, stdout, and stderr

Input Output Examples

Name	Type	Req	Description
compiler	string	–	Compiler ID from list_compilers (e.g. "g161"). If omitted, uses the language's `defaultCompiler` from list_languages.
execute	boolean	–	Run the program instead of returning assembly. `asm` becomes empty; runtime output goes to top-level `stdout`/`stderr`; compile diagnostics move to `buildResult.stdout`/`stderr`.
filters	object	–	Output filters
language	string	yes	Language ID (e.g. "c++", "c", "rust", "python")
libraries	array	–	Libraries to link.
maxAsmLines	integer	–	Cap asm output (default 500 lines).
maxStderrLines	integer	–	Cap each stderr stream — compile and execute separately (default 100).
maxStdoutLines	integer	–	Cap each stdout stream — compile and execute separately (default 100).
options	string	–	Compiler flags (e.g. "-O2 -std=c++20 -Wall")
source	string	yes	Source code to compile
stdin	string	–	Standard input for execution (requires execute=true)

No output schema declared.

No examples provided.

generate_short_url ~109

Create a Compiler Explorer short URL for sharing code with compiler settings

Input Output Examples

Name	Type	Req	Description
compiler	string	yes	Compiler ID from list_compilers (e.g. "g161", "clang_trunk")
language	string	yes	Language ID (e.g. "c++", "c", "rust")
libraries	array	–	Libraries to include.
options	string	–	Compiler flags (e.g. "-O2 -std=c++20")
source	string	yes	Source code

No output schema declared.

No examples provided.

get_shortlink_info ~120

Retrieve source and compiler config from a CE short URL. Compiler entries are returned in the `compile` tool's shape ({compiler, options, libraries:[{id, version}]}). Multi-pane shortlinks (executors, conformance views, CMake trees, per-compiler filters/tools) are flattened — only the basic compile inputs survive.

Input Output Examples

Name	Type	Req	Description
id	string	yes	Short link ID or full URL (e.g. "G38YP7eW4" or "https://godbolt.org/z/G38YP7eW4")

No output schema declared.

No examples provided.

list_compilers ~355

List available compilers, optionally filtered by language

Input Output Examples

Name	Type	Req	Description
includeExperimental	boolean	–	With `latestPerMajor: true`, also include experimental compilers (c++ proposal forks, llvm-mos platform variants). Off by default — bloats "newest X" answers.
instructionSet	string	–	Target architecture filter. Combine with `latestPerMajor: true` for "newest X for arch Y" (e.g. `{language:"c++", instructionSet:"amd64", latestPerMajor:true}`).
language	string	–	Language ID to filter by (e.g. "c++", "rust", "python")
latestPerMajor	boolean	–	"Newest X" filter. By release track (stable/nightly/prerelease/experimental): newest stable per (language, instructionSet, semver major); all nightly + prerelease; experimental skipped unless `includ…
lean	boolean	–	Force id+name only, regardless of count. Useful to browse the catalog before drilling in.
match	string	–	Case-insensitive AND-of-tokens filter on id and name. Punctuation splits tokens; numeric tokens match whole-word ("gcc 14.1" matches "14.1.0" not "14.10"); alphanumeric tokens substring-match ("g14"…
maxResults	integer	–	Cap full-detail entries (default 25). Beyond the cap, degrades to lean (id+name only) with a refinement hint.

No output schema declared.

No examples provided.

list_languages ~24

List supported languages. Each entry has `defaultCompiler` and `compilerCount`.

Input Output Examples

Input schema present but exposes no named parameters.

No output schema declared.

No examples provided.

list_libraries ~152

List available libraries for a given programming language

Input Output Examples

Name	Type	Req	Description
language	string	yes	Language ID (e.g. "c++", "rust")
lean	boolean	–	Force id+name only, regardless of count. Useful to browse the catalog before drilling in.
match	string	–	Case-insensitive AND-of-tokens filter on id, name, and version strings (so "boost 1.88" finds Boost when one of its versions matches 1.88.x). Numeric tokens match version-prefix; alphanumeric substri…
maxResults	integer	–	Cap full-detail entries (default 25). Beyond the cap, degrades to lean (id+name only) with a refinement hint.

No output schema declared.

No examples provided.

lookup_asm_instruction ~64

Look up documentation for an assembly instruction

Input Output Examples

Name	Type	Req	Description
instruction_set	string	yes	Instruction set architecture (no default — must match the asm dialect being looked up).
opcode	string	yes	Assembly instruction mnemonic (e.g. "MOV", "ADD", "JMP")

No output schema declared.

No examples provided.

On this page

Handy links

Scoring key

80+ high trust
60–79 medium
below 60 low

How we score

Score history · last 30 days

18 Aug 20 Aug