| 1 | package evidence |
| 2 | |
| 3 | import ( |
| 4 | "encoding/json" |
| 5 | "strings" |
| 6 | |
| 7 | "reasonix/internal/shellsafe" |
| 8 | ) |
| 9 | |
| 10 | // ClassifyEffect returns the concrete effect profile for one invocation. |
| 11 | func ClassifyEffect(in EffectInput) EffectProfile { |
| 12 | name := strings.ToLower(strings.TrimSpace(in.ToolName)) |
| 13 | args := json.RawMessage(in.Args) |
| 14 | if isShellToolName(name) { |
| 15 | return classifyBashEffect(args, in) |
| 16 | } |
| 17 | if in.Hint.Present && in.Hint.ReadOnly { |
| 18 | return readOnlyProfile(targetsFrom(in, nil), ReasonHintReadOnly) |
| 19 | } |
| 20 | if in.StaticReadOnly || IsNonMutationMetaTool(in.ToolName) { |
| 21 | return readOnlyProfile(targetsFrom(in, nil), ReasonReadOnly) |
| 22 | } |
| 23 | switch name { |
| 24 | case "ask", "todo_write", "complete_step", "job_output", "bash_output", "wait": |
| 25 | return readOnlyProfile(nil, ReasonReadOnly) |
| 26 | case "remember", "forget", "set_session_title", "job_kill", "kill_shell": |
| 27 | return EffectProfile{Known: true, HostState: true, Reason: ReasonHostState} |
| 28 | } |
| 29 | profile := writerProfile(in) |
| 30 | if in.Hint.Present { |
| 31 | applyCallHint(&profile, in.Hint) |
| 32 | } |
| 33 | return profile |
| 34 | } |
| 35 | |
| 36 | func isShellToolName(name string) bool { |
| 37 | switch strings.ToLower(strings.TrimSpace(name)) { |
| 38 | case "bash", "pwsh", "powershell", "shell": |
| 39 | return true |
| 40 | default: |
| 41 | return false |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | func classifyBashEffect(args json.RawMessage, in EffectInput) EffectProfile { |
| 46 | var fields map[string]json.RawMessage |
| 47 | if err := json.Unmarshal(args, &fields); err != nil { |
| 48 | return opaqueProfile(in, ReasonUnknown) |
| 49 | } |
| 50 | command := stringField(fields, "command") |
| 51 | effect := shellsafe.ClassifyBash(command) |
| 52 | if effect.Certainty != shellsafe.EffectKnown { |
| 53 | if bashCommandIsVerification(command) { |
| 54 | return readOnlyProfile(nil, ReasonReadOnly) |
| 55 | } |
| 56 | // Unproven bash is a pathless workspace write. It is not an MCP opaque |
| 57 | // writer: permission and the shell contract still own the invocation. |
| 58 | return EffectProfile{ |
| 59 | WorkspaceWrite: true, |
| 60 | ExecutesCode: effect.ExecutesCode, |
| 61 | UsesNetwork: effect.UsesNetwork, |
| 62 | Reason: EffectReason(effect.Reason), |
| 63 | } |
| 64 | } |
| 65 | profile := EffectProfile{ |
| 66 | Known: true, |
| 67 | ReadOnly: effect.Writes == 0, |
| 68 | WorkspaceWrite: effect.Writes&shellsafe.WriteWorkspaceContent != 0, |
| 69 | RepoMetadata: effect.Writes&shellsafe.WriteRepositoryMetadata != 0, |
| 70 | HostState: effect.Writes&shellsafe.WriteHostState != 0, |
| 71 | ExternalState: effect.Writes&shellsafe.WriteExternalState != 0, |
| 72 | ExecutesCode: effect.ExecutesCode, |
| 73 | UsesNetwork: effect.UsesNetwork, |
| 74 | Reason: EffectReason(commandEffectReason(effect)), |
| 75 | } |
| 76 | if profile.ReadOnly { |
| 77 | profile.Reason = ReasonReadOnly |
| 78 | } else if profile.ExternalState { |
| 79 | profile.Reason = ReasonExternalState |
| 80 | } else if profile.HostState { |
| 81 | profile.Reason = ReasonHostState |
| 82 | } else if profile.WorkspaceWrite { |
| 83 | profile.Reason = ReasonWorkspaceWrite |
| 84 | } else if profile.RepoMetadata { |
| 85 | profile.Reason = ReasonRepoMetadata |
| 86 | } |
| 87 | applyBashShape(&profile, effect.CommandFamily, command) |
| 88 | profile.Targets = bashTargets(profile) |
| 89 | return profile |
| 90 | } |
| 91 | |
| 92 | func applyBashShape(profile *EffectProfile, family, command string) { |
| 93 | family = strings.ToLower(strings.TrimSpace(family)) |
| 94 | lower := strings.ToLower(command) |
| 95 | switch { |
| 96 | case family == "git push" || strings.HasPrefix(family, "git push"): |
| 97 | profile.ExternalState = true |
| 98 | profile.UsesNetwork = true |
| 99 | if containsForceFlag(lower) { |
| 100 | profile.Destructive = true |
| 101 | profile.Irreversible = true |
| 102 | } |
| 103 | case family == "git clean" && profile.WorkspaceWrite: |
| 104 | profile.Destructive = true |
| 105 | case strings.Contains(family, "publish") || strings.Contains(family, "deploy"): |
| 106 | profile.ExternalState = true |
| 107 | profile.UsesNetwork = true |
| 108 | } |
| 109 | if strings.Contains(lower, "rm -rf") || strings.Contains(lower, "rm -fr") { |
| 110 | profile.Destructive = true |
| 111 | profile.Irreversible = true |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | func containsForceFlag(command string) bool { |
| 116 | for field := range strings.FieldsSeq(command) { |
| 117 | switch field { |
| 118 | case "-f", "--force", "--force-with-lease": |
| 119 | return true |
| 120 | } |
| 121 | } |
| 122 | return false |
| 123 | } |
| 124 | |
| 125 | func bashTargets(p EffectProfile) []Target { |
| 126 | switch { |
| 127 | case p.ExternalState: |
| 128 | return []Target{{Kind: TargetExternal}} |
| 129 | case p.HostState: |
| 130 | return []Target{{Kind: TargetHost}} |
| 131 | case p.RepoMetadata && !p.WorkspaceWrite: |
| 132 | return []Target{{Kind: TargetRepo}} |
| 133 | default: |
| 134 | return nil |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | func writerProfile(in EffectInput) EffectProfile { |
| 139 | paths := declaredPaths(in) |
| 140 | if !in.Hint.Present && !in.Hint.Known && len(paths) == 0 && looksOpaqueName(in.ToolName) { |
| 141 | return opaqueProfile(in, ReasonOpaqueWriter) |
| 142 | } |
| 143 | profile := EffectProfile{ |
| 144 | Known: true, |
| 145 | WorkspaceWrite: true, |
| 146 | Reason: ReasonWorkspaceWrite, |
| 147 | Targets: fileTargets(paths), |
| 148 | } |
| 149 | if in.Hint.Destructive || isDestructiveTool(in.ToolName) { |
| 150 | profile.Destructive = true |
| 151 | profile.Reason = ReasonDestructive |
| 152 | } |
| 153 | return profile |
| 154 | } |
| 155 | |
| 156 | func applyCallHint(profile *EffectProfile, hint CallHint) { |
| 157 | profile.Destructive = profile.Destructive || hint.Destructive |
| 158 | profile.Privileged = profile.Privileged || hint.Privileged |
| 159 | profile.UsesNetwork = profile.UsesNetwork || hint.UsesNetwork |
| 160 | profile.ExecutesCode = profile.ExecutesCode || hint.ExecutesCode |
| 161 | if hint.Destructive { |
| 162 | profile.Reason = ReasonHintDestructive |
| 163 | } |
| 164 | if len(hint.Targets) > 0 && len(profile.Targets) == 0 { |
| 165 | profile.Targets = fileTargets(hint.Targets) |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | func readOnlyProfile(targets []Target, reason EffectReason) EffectProfile { |
| 170 | return EffectProfile{Known: true, ReadOnly: true, Reason: reason, Targets: append([]Target(nil), targets...)} |
| 171 | } |
| 172 | |
| 173 | func opaqueProfile(in EffectInput, reason EffectReason) EffectProfile { |
| 174 | if reason == "" { |
| 175 | reason = ReasonOpaqueWriter |
| 176 | } |
| 177 | return EffectProfile{ |
| 178 | WorkspaceWrite: true, |
| 179 | Destructive: in.Hint.Destructive, |
| 180 | Privileged: in.Hint.Privileged || looksPrivilegedName(in.ToolName), |
| 181 | UsesNetwork: in.Hint.UsesNetwork, |
| 182 | ExecutesCode: in.Hint.ExecutesCode, |
| 183 | Targets: fileTargets(declaredPaths(in)), |
| 184 | Reason: reason, |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | func declaredPaths(in EffectInput) []string { |
| 189 | var paths []string |
| 190 | if len(in.ActualPaths) > 0 { |
| 191 | paths = append(paths, in.ActualPaths...) |
| 192 | } else { |
| 193 | paths = append(paths, ToolCallPaths(in.Args)...) |
| 194 | } |
| 195 | if in.Hint.Present { |
| 196 | paths = append(paths, in.Hint.Targets...) |
| 197 | } |
| 198 | return uniquePaths(paths) |
| 199 | } |
| 200 | |
| 201 | func targetsFrom(in EffectInput, extra []string) []Target { |
| 202 | paths := append(declaredPaths(in), extra...) |
| 203 | return fileTargets(uniquePaths(paths)) |
| 204 | } |
| 205 | |
| 206 | func fileTargets(paths []string) []Target { |
| 207 | if len(paths) == 0 { |
| 208 | return nil |
| 209 | } |
| 210 | out := make([]Target, 0, len(paths)) |
| 211 | for _, p := range paths { |
| 212 | p = strings.TrimSpace(p) |
| 213 | if p == "" { |
| 214 | continue |
| 215 | } |
| 216 | kind := TargetFile |
| 217 | if strings.HasSuffix(p, "/") { |
| 218 | kind = TargetDirectory |
| 219 | } |
| 220 | out = append(out, Target{Path: p, Kind: kind}) |
| 221 | } |
| 222 | return out |
| 223 | } |
| 224 | |
| 225 | func uniquePaths(paths []string) []string { |
| 226 | seen := make(map[string]bool, len(paths)) |
| 227 | var out []string |
| 228 | for _, p := range paths { |
| 229 | p = strings.TrimSpace(p) |
| 230 | if p == "" || seen[p] { |
| 231 | continue |
| 232 | } |
| 233 | seen[p] = true |
| 234 | out = append(out, p) |
| 235 | } |
| 236 | return out |
| 237 | } |
| 238 | |
| 239 | func looksOpaqueName(name string) bool { |
| 240 | lower := strings.ToLower(strings.TrimSpace(name)) |
| 241 | return strings.HasPrefix(lower, "mcp__") || strings.HasPrefix(lower, "mcp-tool:") |
| 242 | } |
| 243 | |
| 244 | func looksPrivilegedName(name string) bool { |
| 245 | lower := strings.ToLower(strings.TrimSpace(name)) |
| 246 | for _, hint := range []string{"mcp__", "install_source", "install_skill", "plugin"} { |
| 247 | if strings.Contains(lower, hint) { |
| 248 | return true |
| 249 | } |
| 250 | } |
| 251 | return false |
| 252 | } |
| 253 | |
| 254 | func isDestructiveTool(name string) bool { |
| 255 | switch strings.ToLower(strings.TrimSpace(name)) { |
| 256 | case "delete_file", "delete_symbol", "remove_file": |
| 257 | return true |
| 258 | default: |
| 259 | return false |
| 260 | } |
| 261 | } |
| 262 |