MCP, MCP server
GrayMatter
GrayMatter, an MCP server listed in the PlugVet directory.
Compatibility: Not stated.
Grade B
Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.
Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.
NETWORK_NO_FIXED_HOST PERMISSION_SHELL_DECLARED SECRETS_ENV_READ OBFUSCATION_FILE_OVER_READ_CAP
Why this grade
- NETWORK_NO_FIXED_HOST Low
Makes a network call whose host is not written as a fixed address.
cmd/graymatter/cmd_server.go, line 45
curl -H "Authorization: Bearer $TOKEN" "http://127.0.0.1:8080/facts?agent=alice" - PERMISSION_SHELL_DECLARED Note
Runs shell commands, and the manifest or description says so.
benchmarks/agent_lifecycle/main.go, line 159
cmd := exec.Command(binary, "mcp", "serve") - SECRETS_ENV_READ Note
Reads an environment variable whose name contains KEY, SECRET, TOKEN, PASSWORD or CREDENTIAL.
config.go, line 239
AnthropicAPIKey: os.Getenv("ANTHROPIC_API_KEY"), - OBFUSCATION_FILE_OVER_READ_CAP Note
A file was over the read cap and was not fully read.
docs/validation/confidence-quality.json, line 1
{
Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.
Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.
What was checked
Plain notes from the hygiene checks.
Permissions
Note
requests shell access. The manifest names this permission.
PERMISSION_SHELL_DECLARED
benchmarks/agent_lifecycle/main.go, line 159
cmd := exec.Command(binary, "mcp", "serve")
benchmarks/agent_lifecycle/main.go, line 278
build := exec.Command("go", "build", "-o", *binary, "./cmd/graymatter")
benchmarks/agent_lifecycle/main.go, line 300
stop := exec.Command(*binary, "--dir", storeDir, "daemon", "stop")
Show more
benchmarks/hook_latency/main.go, line 281
cmd := exec.Command(binary, "--dir", storeDir, "daemon", "stop")
benchmarks/hook_latency/main.go, line 370
cmd := exec.Command(binary, args...)
benchmarks/hook_latency/main.go, line 567
build := exec.Command("go", "build", "-o", bin, ".")
cmd/graymatter/adjacent_acceptance_e2e_test.go, line 380
httpProcess := exec.CommandContext(ctx, clients[0].command, httpArgs...)
cmd/graymatter/adjacent_acceptance_e2e_test.go, line 564
build := exec.Command("go", "build", "-o", oldBinary, stubSource)
Install and update
Pass
No install-time script found, and dependencies are pinned or absent.
Network
Concern
can reach a host that is not written as a fixed address.
NETWORK_NO_FIXED_HOST
cmd/graymatter/cmd_server.go, line 45
curl -H "Authorization: Bearer $TOKEN" "http://127.0.0.1:8080/facts?agent=alice"
cmd/graymatter/internal/kgrender/render_test.go, line 39
for _, banned := range []string{"<link", "<img ", "src=", "href=", "fetch(", "XMLHttpRequest", "import(", "@import"} {
cmd/graymatter/internal/usage/costs.go, line 92
s, fetchErr := fetch(callCtx, c, now)
Secrets
Note
reads an environment variable.
SECRETS_ENV_READ
config.go, line 239
AnthropicAPIKey: os.Getenv("ANTHROPIC_API_KEY"),
config.go, line 240
VoyageAPIKey: os.Getenv("VOYAGE_API_KEY"),
config.go, line 241
OpenAIAPIKey: os.Getenv("OPENAI_API_KEY"),
Show more
config.go, line 270
if os.Getenv("ANTHROPIC_API_KEY") != "" {
cmd/graymatter/internal/harness/runner.go, line 236
apiKey = os.Getenv("ANTHROPIC_API_KEY")
cmd/graymatter/internal/server/server_test.go, line 52
func (testConsolidateCfg) GetAnthropicAPIKey() string { return os.Getenv("ANTHROPIC_API_KEY") }
Agent instructions
Pass
No instruction to ignore earlier instructions or to hide a step.
Obfuscation
Note
a file was over the read cap and was not fully read.
OBFUSCATION_FILE_OVER_READ_CAP
docs/validation/confidence-quality.json, line 1
{
Licence
Pass
A licence file is present (LICENSE).
Maintainer activity
Pass
The latest commit is within the last 365 days.
Note
Hygiene check of commit 55b7ed80954b. requests shell access. The manifest names this permission. can reach a host that is not written as a fixed address. reads an environment variable. a file was over the read cap and was not fully read.
Date and source
Date checked:
github.com
Commit graded: 55b7ed80954bc893d86edeb7fea9813f8288f6da
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